998 lines
32 KiB
Groff
998 lines
32 KiB
Groff
.\" Hey, Emacs, edit this file in -*- nroff-fill -*- mode
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.\"-
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.\" Copyright (c) 1997, 1998
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.\" Nan Yang Computer Services Limited. All rights reserved.
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.\"
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.\" This software is distributed under the so-called ``Berkeley
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.\" License'':
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by Nan Yang Computer
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.\" Services Limited.
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.\" 4. Neither the name of the Company nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" This software is provided ``as is'', and any express or implied
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.\" warranties, including, but not limited to, the implied warranties of
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.\" merchantability and fitness for a particular purpose are disclaimed.
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.\" In no event shall the company or contributors be liable for any
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.\" direct, indirect, incidental, special, exemplary, or consequential
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.\" damages (including, but not limited to, procurement of substitute
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.\" goods or services; loss of use, data, or profits; or business
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.\" interruption) however caused and on any theory of liability, whether
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.\" in contract, strict liability, or tort (including negligence or
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.\" otherwise) arising in any way out of the use of this software, even if
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.\" advised of the possibility of such damage.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd October 5, 1999
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.Dt vinum 4
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.Os
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.Sh NAME
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.Nm vinum
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.Nd Logical Volume Manager
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.Sh SYNOPSIS
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.Cd "kldload vinum"
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.Cd "kldload Vinum"
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.Sh DESCRIPTION
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.Nm
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is a logical volume manager inspired by, but not derived from, the Veritas
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Volume Manager. It provides the following features:
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.Bl -bullet
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.It
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It provides device-independent logical disks, called \fIvolumes\fP. Volumes are
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not restricted to the size of any disk on the system.
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.It
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The volumes consist of one or more \fIplexes\fP, each of which contain the
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entire address space of a volume. This represents an implementation of RAID-1
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(mirroring). Multiple plexes can also be used for
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.\" XXX What about sparse plexes? Do we want them?
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.if t .sp
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.Bl -bullet
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.It
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Increased read throughput.
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.Nm
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will read data from the least active disk, so if a volume has plexes on multiple
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disks, more data can be read in parallel.
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.Nm
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reads data from only one plex, but it writes data to all plexes.
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.It
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Increased reliability. By storing plexes on different disks, data will remain
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available even if one of the plexes becomes unavailable. In comparison with a
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RAID-5 plex (see below), using multiple plexes requires more storage space, but
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gives better performance, particularly in the case of a drive failure.
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.It
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Additional plexes can be used for on-line data reorganization. By attaching an
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additional plex and subsequently detaching one of the older plexes, data can be
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moved on-line without compromising access.
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.It
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An additional plex can be used to obtain a consistent dump of a file system. By
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attaching an additional plex and detaching at a specific time, the detached plex
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becomes an accurate snapshot of the file system at the time of detachment.
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.\" Make sure to flush!
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.El
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.It
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Each plex consists of one or more logical disk slices, called \fIsubdisks\fP.
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Subdisks are defined as a contiguous block of physical disk storage. A plex may
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consist of any reasonable number of subdisks (in other words, the real limit is
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not the number, but other factors, such as memory and performance, associated
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with maintaining a large number of subdisks).
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.It
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A number of mappings between subdisks and plexes are available:
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.Bl -bullet
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.It
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\fIConcatenated plexes\fP\| consist of one or more subdisks, each of which
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is mapped to a contiguous part of the plex address space.
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.It
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\fIStriped plexes\fP\| consist of two or more subdisks of equal size. The file
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address space is mapped in \fIstripes\fP, integral fractions of the subdisk
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size. Consecutive plex address space is mapped to stripes in each subdisk in
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.if n turn.
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.if t \{\
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turn.
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.ig
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.\" FIXME
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.br
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.ne 1.5i
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.PS
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move right 2i
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down
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SD0: box
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SD1: box
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SD2: box
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"plex 0" at SD0.n+(0,.2)
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"subdisk 0" rjust at SD0.w-(.2,0)
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"subdisk 1" rjust at SD1.w-(.2,0)
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"subdisk 2" rjust at SD2.w-(.2,0)
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.PE
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..
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.\}
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The subdisks of a striped plex must all be the same size.
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.It
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\fIRAID-5 plexes\fP\| require at least three equal-sized subdisks. They
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resemble striped plexes, except that in each stripe, one subdisk stores parity
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information. This subdisk changes in each stripe: in the first stripe, it is the
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first subdisk, in the second it is the second subdisk, etc. In the event of a
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single disk failure,
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.Nm
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will recover the data based on the information stored on the remaining subdisks.
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This mapping is particularly suited to read-intensive access. The subdisks of a
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RAID-5 plex must all be the same size.
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.\" Make sure to flush!
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.El
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.It
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.Nm Drives
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are the lowest level of the storage hierarchy. They represent disk special
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devices.
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.It
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.Nm
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offers automatic startup. Unlike UNIX file systems,
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.Nm
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volumes contain all the configuration information needed to ensure that they are
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started correctly when the subsystem is enabled. This is also a significant
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advantage over the Veritas\(tm File System. This feature regards the presence
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of the volumes. It does not mean that the volumes will be mounted
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automatically, since the standard startup procedures with
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.Pa /etc/fstab
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perform this function.
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.El
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.Sh KERNEL CONFIGURATION
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.Nm
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is currently supplied as a kernel loadable module (kld), and does not require
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configuration. As with other klds, it is absolutely necessary to match the kld
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to the version of the operating system. Failure to do so will cause
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.Nm
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to issue an error message and terminate.
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.Pp
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It is possible to configure
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.Nm
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in the kernel, but this is not recommended. To do so, add this line to the
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kernel configuration file:
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.Bd -literal -offset indent
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device vinum
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.Ed
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.Pp
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.Ss DEBUG OPTIONS
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The current version of
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.Nm ,
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both the kernel module and the user program
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.Xr vinum 8 ,
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include significant debugging support. It is not recommended to remove
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this support at the moment, but if you do you must remove it from both the
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kernel and the user components. To do this, edit the files
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.Pa /usr/src/sbin/vinum/Makefile
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and
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.Pa /usr/src/sys/modules/vinum/Makefile
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and edit the CFLAGS variable to remove the -DVINUMDEBUG option. If you have
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configured
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.Nm
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into the kernel, either specify the line
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.Bd -literal -offset indent
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options VINUMDEBUG
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.Ed
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.Pp
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in the kernel configuration file or remove the -DVINUMDEBUG option from
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.Pa /usr/src/sbin/vinum/Makefile
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as described above.
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.Pp
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If the VINUMDEBUG variables do not match,
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.Xr vinum 8
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will fail with a message
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explaining the problem and what to do to correct it.
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.Pp
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.Nm
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was previously available in two versions: a freely available version which did
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not contain RAID-5 functionality, and a full version including RAID-5
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functionality, which was available only from Cybernet Systems Inc. The present
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version of
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.Nm
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includes the RAID-5 functionality.
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.Sh RUNNING VINUM
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.Nm
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is part of the base
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.Fx
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system. It does not require installation.
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To start it, start the
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.Nm
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program, which will load the kld if it is not already present.
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Before using
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.Nm ,
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it must be configured. See
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.Xr vinum 8
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for information on how to create a
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.Nm
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configuration.
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.Pp
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Normally, you start a configured version of
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.Nm
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at boot time. Set the variable
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.Ar start_vinum
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in
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.Pa /etc/rc.conf
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to
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.Ar YES
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to start
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.Nm
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at boot time.
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.Pp
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If
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.Nm
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is loaded as a kld (the recommended way), the
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.Nm
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.Ar stop
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command will unload it. You can also do this with the
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.Nm kldunload
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command.
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.Pp
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The kld can only be unloaded when idle, in other words when no volumes are
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mounted and no other instances of the
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.Nm
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program are active. Unloading the kld does not harm the data in the volumes.
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.Ss CONFIGURING AND STARTING OBJECTS
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Use the
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.Xr vinum 8
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utility to configure and start
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.Nm
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objects.
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.Sh IOCTL CALLS
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.Pa ioctl
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calls are intended for the use of the
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.Nm
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configuration program only. They are described in the header file
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.Pa /sys/dev/vinum/vinumio.h
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.Ss DISK LABELS
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Conventional disk special devices have a
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.Em disk label
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in the second sector of the device. See
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.Xr disklabel 5
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for more details. This disk label describes the layout of the partitions within
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the device.
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.Nm
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does not subdivide volumes, so volumes do not contain a physical disk label.
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For convenience,
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.Nm
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implements the ioctl calls DIOCGDINFO (get disk label), DIOCGPART (get partition
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information), DIOCWDINFO (write partition information) and DIOCSDINFO (set
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partition information). DIOCGDINFO and DIOCGPART refer to an internal
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representation of the disk label which is not present on the volume. As a
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result, the
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.Fl r
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option of
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.Xr disklabel 8 ,
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which reads the
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.if t ``raw disk'',
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.if n "raw disk",
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will fail.
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.Pp
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In general,
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.Xr disklabel 8
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serves no useful purpose on a vinum volume. If you run it, it will show you
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three partitions, a, b and c, all the same except for the fstype, for example:
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.br
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.ne 1i
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.Bd -literal -offset
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3 partitions:
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# size offset fstype [fsize bsize bps/cpg]
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a: 2048 0 4.2BSD 1024 8192 0 # (Cyl. 0 - 0)
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b: 2048 0 swap # (Cyl. 0 - 0)
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c: 2048 0 unused 0 0 # (Cyl. 0 - 0)
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.Ed
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.Pp
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.Nm
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ignores the DIOCWDINFO and DIOCSDINFO ioctls, since there is nothing to change.
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As a result, any attempt to modify the disk label will be silently ignored.
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.Sh MAKING FILE SYSTEMS
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Since
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.Nm
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volumes do not contain partitions, the names do not need to conform to the
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standard rules for naming disk partitions. For a physical disk partition, the
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last letter of the device name specifies the partition identifier (a to h).
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.Nm
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volumes need not conform to this convention, but if they do not,
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.Nm newfs
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will complain that it cannot determine the partition. To solve this problem,
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use the
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.Fl v
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flag to
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.Nm newfs .
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For example, if you have a volume
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.Pa concat ,
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use the following command to create a ufs file system on it:
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.Pp
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.Bd -literal
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# newfs -v /dev/vinum/concat
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.Ed
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.Sh OBJECT NAMING
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.Nm
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assigns default names to plexes and subdisks, although they may be overridden.
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We do not recommend overriding the default names. Experience with the
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.if t Veritas\(tm
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.if n Veritas(tm)
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volume manager, which allows arbitrary naming of objects, has shown that this
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flexibility does not bring a significant advantage, and it can cause confusion.
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.sp
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Names may contain any non-blank character, but it is recommended to restrict
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them to letters, digits and the underscore characters. The names of volumes,
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plexes and subdisks may be up to 64 characters long, and the names of drives may
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up to 32 characters long. When choosing volume and plex names, bear in mind
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that automatically generated plex and subdisk names are longer than the name
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from which they are derived.
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.Bl -bullet
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.It
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When
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.Xr vinum 8
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creates or deletes objects, it creates a directory
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.Pa /dev/vinum ,
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in which it makes device entries for each volume it finds. It also creates
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subdirectories,
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.Pa /dev/vinum/plex
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and
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.Pa /dev/vinum/sd ,
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in which it stores device entries for plexes and subdisks.
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In addition, it creates two more directories,
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.Pa /dev/vinum/vol
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and
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.Pa /dev/vinum/drive ,
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in which it stores hierarchical information for volumes and drives.
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.It
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In addition,
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.Nm
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creates three super-devices,
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.Pa /dev/vinum/control ,
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.Pa /dev/vinum/Control
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and
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.Pa /dev/vinum/controld .
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.Pa /dev/vinum/control
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is used by
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.Xr vinum 8
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when it has been compiled without the VINUMDEBUG option,
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.Pa /dev/vinum/Control
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is used by
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.Xr vinum 8
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when it has been compiled with the VINUMDEBUG option,
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and
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.Pa /dev/vinum/controld
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is used by the
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.Nm
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daemon. The two control devices for
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.Xr vinum 8
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are used to synchronize the debug status of kernel and user modules.
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.It
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Unlike
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.Nm UNIX
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drives,
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.Nm
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volumes are not subdivided into partitions, and thus do not contain a disk
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label. Unfortunately, this confuses a number of utilities, notably
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.Nm newfs ,
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which normally tries to interpret the last letter of a
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.Nm
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volume name as a partition identifier. If you use a volume name which does not
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end in the letters
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.Ar a
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to
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.Ar c ,
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you must use the
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.Fl v
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flag to
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.Nm newfs
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in order to tell it to ignore this convention.
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.\"
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.It
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Plexes do not need to be assigned explicit names. By default, a plex name is
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the name of the volume followed by the letters \f(CW.p\fR and the number of the
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plex. For example, the plexes of volume
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.Ar vol3
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are called
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.Ar vol3.p0 ,
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.Ar vol3.p1
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and so on. These names can be overridden, but it is not recommended.
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.br
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.It
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Like plexes, subdisks are assigned names automatically, and explicit naming is
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discouraged. A subdisk name is the name of the plex followed by the letters
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\f(CW\&.s\fR and a number identifying the subdisk. For example, the subdisks of
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plex
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.Ar vol3.p0
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are called
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.Ar vol3.p0.s0 ,
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.Ar vol3.p0.s1
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and so on.
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.br
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.It
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By contrast,
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.Nm drives
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must be named. This makes it possible to move a drive to a different location
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and still recognize it automatically. Drive names may be up to 32 characters
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long.
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.El
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.Pp
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EXAMPLE
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.Pp
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Assume the
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.Nm
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objects described in the section CONFIGURATION FILE in
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.Xr vinum 8 .
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The directory
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.Ar /dev/vinum
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looks like:
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.Bd -literal -offset indent
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# ls -lR /dev/vinum
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total 5
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brwxr-xr-- 1 root wheel 25, 2 Mar 30 16:08 concat
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brwx------ 1 root wheel 25, 0x40000000 Mar 30 16:08 control
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brwx------ 1 root wheel 25, 0x40000001 Mar 30 16:08 controld
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drwxrwxrwx 2 root wheel 512 Mar 30 16:08 drive
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drwxrwxrwx 2 root wheel 512 Mar 30 16:08 plex
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drwxrwxrwx 2 root wheel 512 Mar 30 16:08 rvol
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drwxrwxrwx 2 root wheel 512 Mar 30 16:08 sd
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brwxr-xr-- 1 root wheel 25, 3 Mar 30 16:08 strcon
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brwxr-xr-- 1 root wheel 25, 1 Mar 30 16:08 stripe
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brwxr-xr-- 1 root wheel 25, 0 Mar 30 16:08 tinyvol
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drwxrwxrwx 7 root wheel 512 Mar 30 16:08 vol
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brwxr-xr-- 1 root wheel 25, 4 Mar 30 16:08 vol5
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/dev/vinum/drive:
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total 0
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brw-r----- 1 root operator 4, 15 Oct 21 16:51 drive2
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brw-r----- 1 root operator 4, 31 Oct 21 16:51 drive4
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/dev/vinum/plex:
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total 0
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brwxr-xr-- 1 root wheel 25, 0x10000002 Mar 30 16:08 concat.p0
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brwxr-xr-- 1 root wheel 25, 0x10010002 Mar 30 16:08 concat.p1
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brwxr-xr-- 1 root wheel 25, 0x10000003 Mar 30 16:08 strcon.p0
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brwxr-xr-- 1 root wheel 25, 0x10010003 Mar 30 16:08 strcon.p1
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brwxr-xr-- 1 root wheel 25, 0x10000001 Mar 30 16:08 stripe.p0
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brwxr-xr-- 1 root wheel 25, 0x10000000 Mar 30 16:08 tinyvol.p0
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brwxr-xr-- 1 root wheel 25, 0x10000004 Mar 30 16:08 vol5.p0
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brwxr-xr-- 1 root wheel 25, 0x10010004 Mar 30 16:08 vol5.p1
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/dev/vinum/sd:
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total 0
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brwxr-xr-- 1 root wheel 25, 0x20000002 Mar 30 16:08 concat.p0.s0
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brwxr-xr-- 1 root wheel 25, 0x20100002 Mar 30 16:08 concat.p0.s1
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brwxr-xr-- 1 root wheel 25, 0x20010002 Mar 30 16:08 concat.p1.s0
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brwxr-xr-- 1 root wheel 25, 0x20000003 Mar 30 16:08 strcon.p0.s0
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brwxr-xr-- 1 root wheel 25, 0x20100003 Mar 30 16:08 strcon.p0.s1
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brwxr-xr-- 1 root wheel 25, 0x20010003 Mar 30 16:08 strcon.p1.s0
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brwxr-xr-- 1 root wheel 25, 0x20110003 Mar 30 16:08 strcon.p1.s1
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brwxr-xr-- 1 root wheel 25, 0x20000001 Mar 30 16:08 stripe.p0.s0
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brwxr-xr-- 1 root wheel 25, 0x20100001 Mar 30 16:08 stripe.p0.s1
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brwxr-xr-- 1 root wheel 25, 0x20000000 Mar 30 16:08 tinyvol.p0.s0
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brwxr-xr-- 1 root wheel 25, 0x20100000 Mar 30 16:08 tinyvol.p0.s1
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brwxr-xr-- 1 root wheel 25, 0x20000004 Mar 30 16:08 vol5.p0.s0
|
|
brwxr-xr-- 1 root wheel 25, 0x20100004 Mar 30 16:08 vol5.p0.s1
|
|
brwxr-xr-- 1 root wheel 25, 0x20010004 Mar 30 16:08 vol5.p1.s0
|
|
brwxr-xr-- 1 root wheel 25, 0x20110004 Mar 30 16:08 vol5.p1.s1
|
|
|
|
/dev/vinum/vol:
|
|
total 5
|
|
brwxr-xr-- 1 root wheel 25, 2 Mar 30 16:08 concat
|
|
drwxr-xr-x 4 root wheel 512 Mar 30 16:08 concat.plex
|
|
brwxr-xr-- 1 root wheel 25, 3 Mar 30 16:08 strcon
|
|
drwxr-xr-x 4 root wheel 512 Mar 30 16:08 strcon.plex
|
|
brwxr-xr-- 1 root wheel 25, 1 Mar 30 16:08 stripe
|
|
drwxr-xr-x 3 root wheel 512 Mar 30 16:08 stripe.plex
|
|
brwxr-xr-- 1 root wheel 25, 0 Mar 30 16:08 tinyvol
|
|
drwxr-xr-x 3 root wheel 512 Mar 30 16:08 tinyvol.plex
|
|
brwxr-xr-- 1 root wheel 25, 4 Mar 30 16:08 vol5
|
|
drwxr-xr-x 4 root wheel 512 Mar 30 16:08 vol5.plex
|
|
|
|
/dev/vinum/vol/concat.plex:
|
|
total 2
|
|
brwxr-xr-- 1 root wheel 25, 0x10000002 Mar 30 16:08 concat.p0
|
|
drwxr-xr-x 2 root wheel 512 Mar 30 16:08 concat.p0.sd
|
|
brwxr-xr-- 1 root wheel 25, 0x10010002 Mar 30 16:08 concat.p1
|
|
drwxr-xr-x 2 root wheel 512 Mar 30 16:08 concat.p1.sd
|
|
|
|
/dev/vinum/vol/concat.plex/concat.p0.sd:
|
|
total 0
|
|
brwxr-xr-- 1 root wheel 25, 0x20000002 Mar 30 16:08 concat.p0.s0
|
|
brwxr-xr-- 1 root wheel 25, 0x20100002 Mar 30 16:08 concat.p0.s1
|
|
|
|
/dev/vinum/vol/concat.plex/concat.p1.sd:
|
|
total 0
|
|
brwxr-xr-- 1 root wheel 25, 0x20010002 Mar 30 16:08 concat.p1.s0
|
|
|
|
/dev/vinum/vol/strcon.plex:
|
|
total 2
|
|
brwxr-xr-- 1 root wheel 25, 0x10000003 Mar 30 16:08 strcon.p0
|
|
drwxr-xr-x 2 root wheel 512 Mar 30 16:08 strcon.p0.sd
|
|
brwxr-xr-- 1 root wheel 25, 0x10010003 Mar 30 16:08 strcon.p1
|
|
drwxr-xr-x 2 root wheel 512 Mar 30 16:08 strcon.p1.sd
|
|
|
|
/dev/vinum/vol/strcon.plex/strcon.p0.sd:
|
|
total 0
|
|
brwxr-xr-- 1 root wheel 25, 0x20000003 Mar 30 16:08 strcon.p0.s0
|
|
brwxr-xr-- 1 root wheel 25, 0x20100003 Mar 30 16:08 strcon.p0.s1
|
|
|
|
/dev/vinum/vol/strcon.plex/strcon.p1.sd:
|
|
total 0
|
|
brwxr-xr-- 1 root wheel 25, 0x20010003 Mar 30 16:08 strcon.p1.s0
|
|
brwxr-xr-- 1 root wheel 25, 0x20110003 Mar 30 16:08 strcon.p1.s1
|
|
|
|
/dev/vinum/vol/stripe.plex:
|
|
total 1
|
|
brwxr-xr-- 1 root wheel 25, 0x10000001 Mar 30 16:08 stripe.p0
|
|
drwxr-xr-x 2 root wheel 512 Mar 30 16:08 stripe.p0.sd
|
|
|
|
/dev/vinum/vol/stripe.plex/stripe.p0.sd:
|
|
total 0
|
|
brwxr-xr-- 1 root wheel 25, 0x20000001 Mar 30 16:08 stripe.p0.s0
|
|
brwxr-xr-- 1 root wheel 25, 0x20100001 Mar 30 16:08 stripe.p0.s1
|
|
|
|
/dev/vinum/vol/tinyvol.plex:
|
|
total 1
|
|
brwxr-xr-- 1 root wheel 25, 0x10000000 Mar 30 16:08 tinyvol.p0
|
|
drwxr-xr-x 2 root wheel 512 Mar 30 16:08 tinyvol.p0.sd
|
|
|
|
/dev/vinum/vol/tinyvol.plex/tinyvol.p0.sd:
|
|
total 0
|
|
brwxr-xr-- 1 root wheel 25, 0x20000000 Mar 30 16:08 tinyvol.p0.s0
|
|
brwxr-xr-- 1 root wheel 25, 0x20100000 Mar 30 16:08 tinyvol.p0.s1
|
|
|
|
/dev/vinum/vol/vol5.plex:
|
|
total 2
|
|
brwxr-xr-- 1 root wheel 25, 0x10000004 Mar 30 16:08 vol5.p0
|
|
drwxr-xr-x 2 root wheel 512 Mar 30 16:08 vol5.p0.sd
|
|
brwxr-xr-- 1 root wheel 25, 0x10010004 Mar 30 16:08 vol5.p1
|
|
drwxr-xr-x 2 root wheel 512 Mar 30 16:08 vol5.p1.sd
|
|
|
|
/dev/vinum/vol/vol5.plex/vol5.p0.sd:
|
|
total 0
|
|
brwxr-xr-- 1 root wheel 25, 0x20000004 Mar 30 16:08 vol5.p0.s0
|
|
brwxr-xr-- 1 root wheel 25, 0x20100004 Mar 30 16:08 vol5.p0.s1
|
|
|
|
/dev/vinum/vol/vol5.plex/vol5.p1.sd:
|
|
total 0
|
|
brwxr-xr-- 1 root wheel 25, 0x20010004 Mar 30 16:08 vol5.p1.s0
|
|
brwxr-xr-- 1 root wheel 25, 0x20110004 Mar 30 16:08 vol5.p1.s1
|
|
.Ed
|
|
.Pp
|
|
In the case of unattached plexes and subdisks, the naming is reversed. Subdisks
|
|
are named after the disk on which they are located, and plexes are named after
|
|
the subdisk.
|
|
.\" XXX
|
|
.Nm This mapping is still to be determined.
|
|
.Ss OBJECT STATES
|
|
.Pp
|
|
Each
|
|
.Nm
|
|
object has a \fIstate\fR associated with it.
|
|
.Nm
|
|
uses this state to determine the handling of the object.
|
|
.Pp
|
|
.Ss VOLUME STATES
|
|
Volumes may have the following states:
|
|
.sp
|
|
.Bl -hang -width 14n
|
|
.It Li down
|
|
The volume is completely inaccessible.
|
|
.It Li up
|
|
The volume is up and at least partially functional. Not all plexes may be
|
|
available.
|
|
.El
|
|
.Ss "PLEX STATES"
|
|
Plexes may have the following states:
|
|
.sp
|
|
.ne 1i
|
|
.Bl -hang -width 14n
|
|
.It Li referenced
|
|
A plex entry which has been referenced as part of a volume, but which is
|
|
currently not known.
|
|
.It Li faulty
|
|
A plex which has gone completely down because of I/O errors.
|
|
.It Li down
|
|
A plex which has been taken down by the administrator.
|
|
.It Li initializing
|
|
A plex which is being initialized.
|
|
.sp
|
|
The remaining states represent plexes which are at least partially up.
|
|
.It Li corrupt
|
|
A plex entry which is at least partially up. Not all subdisks are available,
|
|
and an inconsistency has occurred. If no other plex is uncorrupted, the volume
|
|
is no longer consistent.
|
|
.It Li degraded
|
|
A RAID-5 plex entry which is accessible, but one subdisk is down, requiring
|
|
recovery for many I/O requests.
|
|
.It Li flaky
|
|
A plex which is really up, but which has a reborn subdisk which we don't
|
|
completely trust, and which we don't want to read if we can avoid it.
|
|
.It Li up
|
|
A plex entry which is completely up. All subdisks are up.
|
|
.El
|
|
.sp 2v
|
|
.Ss "SUBDISK STATES"
|
|
Subdisks can have the following states:
|
|
.sp
|
|
.ne 1i
|
|
.Bl -hang -width 14n
|
|
.It Li empty
|
|
A subdisk entry which has been created completely. All fields are correct, and
|
|
the disk has been updated, but the on the disk is not valid.
|
|
.It Li referenced
|
|
A subdisk entry which has been referenced as part of a plex, but which is
|
|
currently not known.
|
|
.It Li initializing
|
|
A subdisk entry which has been created completely and which is currently being
|
|
initialized.
|
|
.sp
|
|
The following states represent invalid data.
|
|
.It Li obsolete
|
|
A subdisk entry which has been created completely. All fields are correct, the
|
|
config on disk has been updated, and the data was valid, but since then the
|
|
drive has been taken down, and as a result updates have been missed.
|
|
.It Li stale
|
|
A subdisk entry which has been created completely. All fields are correct, the
|
|
disk has been updated, and the data was valid, but since then the drive has been
|
|
crashed and updates have been lost.
|
|
.sp
|
|
The following states represent valid, inaccessible data.
|
|
.It Li crashed
|
|
A subdisk entry which has been created completely. All fields are correct, the
|
|
disk has been updated, and the data was valid, but since then the drive has gone
|
|
down. No attempt has been made to write to the subdisk since the crash, so the
|
|
data is valid.
|
|
.It Li down
|
|
A subdisk entry which was up, which contained valid data, and which was taken
|
|
down by the administrator. The data is valid.
|
|
.It Li reviving
|
|
The subdisk is currently in the process of being revived. We can write but not
|
|
read.
|
|
.sp
|
|
The following states represent accessible subdisks with valid data.
|
|
.It Li reborn
|
|
A subdisk entry which has been created completely. All fields are correct, the
|
|
disk has been updated, and the data was valid, but since then the drive has gone
|
|
down and up again. No updates were lost, but it is possible that the subdisk
|
|
has been damaged. We won't read from this subdisk if we have a choice. If this
|
|
is the only subdisk which covers this address space in the plex, we set its
|
|
state to up under these circumstances, so this status implies that there is
|
|
another subdisk to fulfill the request.
|
|
.It Li up
|
|
A subdisk entry which has been created completely. All fields are correct, the
|
|
disk has been updated, and the data is valid.
|
|
.El
|
|
.sp 2v
|
|
.Ss "DRIVE STATES"
|
|
Drives can have the following states:
|
|
.sp
|
|
.ne 1i
|
|
.Bl -hang -width 14n
|
|
.It Li referenced
|
|
At least one subdisk refers to the drive, but it is not currently accessible to
|
|
the system. No device name is known.
|
|
.It Li down
|
|
The drive is not accessible.
|
|
.It Li up
|
|
The drive is up and running.
|
|
.El
|
|
.sp 2v
|
|
.Sh BUGS
|
|
.Bl -enum
|
|
.It
|
|
.Nm
|
|
is a new product. Bugs can be expected. The configuration mechanism is not yet
|
|
fully functional. If you have difficulties, please look at the section
|
|
DEBUGGING PROBLEMS WITH VINUM before reporting problems.
|
|
.It
|
|
Kernels with the
|
|
.Nm
|
|
pseudo-device appear to work, but are not supported. If you have trouble with
|
|
this configuration, please first replace the kernel with a non-Vinum
|
|
kernel and test with the kld module.
|
|
.It
|
|
Detection of differences between the version of the kernel and the kld is not
|
|
yet implemented.
|
|
.It
|
|
The RAID-5 functionality is new in
|
|
.Fx 3.3 .
|
|
Some problems have been
|
|
reported with
|
|
.Nm
|
|
in combination with soft updates, but these are not reproducible on all
|
|
systems. If you are planning to use
|
|
.Nm
|
|
in a production environment, please test carefully.
|
|
.El
|
|
.Sh DEBUGGING PROBLEMS WITH VINUM
|
|
Solving problems with
|
|
.Nm
|
|
can be a difficult affair. This section suggests some approaches.
|
|
.Ss Configuration problems
|
|
.Pp
|
|
It is relatively easy (too easy) to run into problems with the
|
|
.Nm
|
|
configuration. If you do, the first thing you should do is stop configuration
|
|
updates:
|
|
.if t .ps -3
|
|
.if t .vs -3
|
|
.Bd -literal
|
|
# vinum setdaemon 4
|
|
.Ed
|
|
.if t .vs
|
|
.if t .ps
|
|
.Pp
|
|
This will stop updates and any further corruption of the on-disk configuration.
|
|
.Pp
|
|
Next, look at the on-disk configuration, using a Bourne-style shell:
|
|
.if t .ps -3
|
|
.if t .vs -3
|
|
.Bd -literal
|
|
# rm -f log
|
|
# for i in /dev/da0s1h /dev/da1s1h /dev/da2s1h /dev/da3s1h; do
|
|
(dd if=$i skip=8 count=6|tr -d '\e000-\e011\e200-\e377'; echo) >> log
|
|
done
|
|
.Ed
|
|
.if t .vs
|
|
.if t .ps
|
|
.Pp
|
|
The names of the devices are the names of all
|
|
.Nm
|
|
slices. The file
|
|
.Pa log
|
|
should then contain something like this:
|
|
.if t .ps -3
|
|
.if t .vs -3
|
|
.Bd -literal
|
|
IN VINOpanic.lemis.comdrive1}6E7~^K6T^Yfoovolume obj state up
|
|
volume src state up
|
|
volume raid state down
|
|
volume r state down
|
|
volume foo state up
|
|
plex name obj.p0 state corrupt org concat vol obj
|
|
plex name obj.p1 state corrupt org striped 128b vol obj
|
|
plex name src.p0 state corrupt org striped 128b vol src
|
|
plex name src.p1 state up org concat vol src
|
|
plex name raid.p0 state faulty org disorg vol raid
|
|
plex name r.p0 state faulty org disorg vol r
|
|
plex name foo.p0 state up org concat vol foo
|
|
plex name foo.p1 state faulty org concat vol foo
|
|
sd name obj.p0.s0 drive drive2 plex obj.p0 state reborn len 409600b driveoffset 265b plexoffset 0b
|
|
sd name obj.p0.s1 drive drive4 plex obj.p0 state up len 409600b driveoffset 265b plexoffset 409600b
|
|
sd name obj.p1.s0 drive drive1 plex obj.p1 state up len 204800b driveoffset 265b plexoffset 0b
|
|
sd name obj.p1.s1 drive drive2 plex obj.p1 state reborn len 204800b driveoffset 409865b plexoffset 128b
|
|
sd name obj.p1.s2 drive drive3 plex obj.p1 state up len 204800b driveoffset 265b plexoffset 256b
|
|
sd name obj.p1.s3 drive drive4 plex obj.p1 state up len 204800b driveoffset 409865b plexoffset 384b
|
|
.Ed
|
|
.if t .vs
|
|
.if t .ps
|
|
.Pp
|
|
The first line contains the
|
|
.Nm
|
|
label and must start with the text
|
|
.Li IN VINO .
|
|
It also contains the name of the system. The exact definition is contained in
|
|
.Pa /usr/src/sys/dev/vinum/vinumvar.h .
|
|
The saved configuration starts in the middle of the line with the text
|
|
.Li volume obj state up
|
|
and starts in sector 9 of the disk.
|
|
The rest of the output shows the remainder of the on-disk configuration. It
|
|
may be necessary to increase the
|
|
.Ar count
|
|
argument of
|
|
.Cm dd
|
|
in order to see the complete configuration.
|
|
.Pp
|
|
The configuration on all disks should be the same. If this is not the case,
|
|
please report the problem with the exact contents of the file
|
|
.Pa log .
|
|
There is probably little that can be done to recover the on-disk configuration,
|
|
but if you keep a copy of the files used to create the objects, you should be
|
|
able to re-create them. The
|
|
.Cm create
|
|
command does not change the subdisk data, so this will not cause data
|
|
corruption. You may need to use the
|
|
.Cm resetconfig
|
|
command if you have this kind of trouble.
|
|
.Ss Kernel Panics
|
|
.Pp
|
|
In order to analyse a panic which you suspect comes from
|
|
.Nm
|
|
you will need to build a debug kernel. See the online handbook at
|
|
.Pa /usr/share/doc/handbook/kerneldebug.html
|
|
(if installed) or
|
|
.Pa http://www.FreeBSD.org/handbook/kerneldebug.html
|
|
for more details of how to do this.
|
|
.Pp
|
|
Perform the following steps to analyse a
|
|
.Nm
|
|
problem:
|
|
.Bl -enum
|
|
.It
|
|
Copy the files
|
|
.Pa /usr/src/sys/modules/vinum/.gdbinit.crash ,
|
|
.Pa /usr/src/sys/modules/vinum/.gdbinit.kernel ,
|
|
.Pa /usr/src/sys/modules/vinum/.gdbinit.serial ,
|
|
.Pa /usr/src/sys/modules/vinum/.gdbinit.vinum
|
|
and
|
|
.Pa /usr/src/sys/modules/vinum/.gdbinit.vinum.paths
|
|
to the directory in which you will be performing the analysis, typically
|
|
.Pa /var/crash .
|
|
.It
|
|
Make sure that you build the
|
|
.Nm
|
|
module with debugging information. The standard
|
|
.Pa Makefile
|
|
builds a module with debugging symbols by default. If the version of
|
|
.Nm
|
|
in
|
|
.Pa /modules
|
|
does not contain symbols, you will not get an error message, but the stack trace
|
|
will not show the symbols. Check the module before starting
|
|
.Nm gdb :
|
|
.Bd -literal
|
|
$ file /modules/vinum.ko
|
|
/modules/vinum.ko: ELF 32-bit LSB shared object, Intel 80386,
|
|
version 1 (FreeBSD), not stripped
|
|
.Ed
|
|
.Pp
|
|
If the output shows that
|
|
.Pa /modules/vinum.ko
|
|
is stripped, you will have to find a version which is not. Usually this will be
|
|
either in
|
|
.Pa /usr/obj/sys/modules/vinum/vinum.ko
|
|
(if you have built
|
|
.Nm
|
|
with a
|
|
.Ar make world )
|
|
or
|
|
.Pa /usr/src/sys/modules/vinum/vinum.ko
|
|
(if you have built
|
|
.Nm
|
|
in this directory). Modify the file
|
|
.Pa .gdbinit.vinum.paths
|
|
accordingly.
|
|
.It
|
|
Either take a dump or use remote serial
|
|
.Cm gdb
|
|
to analyse the problem. To analyse a dump, say
|
|
.Pa /var/crash/vmcore.5 ,
|
|
link
|
|
.Pa /var/crash/.gdbinit.crash
|
|
to
|
|
.Pa /var/crash/.gdbinit
|
|
and enter:
|
|
.Bd -literal
|
|
# cd /var/crash
|
|
# gdb -k kernel.debug vmcore.5
|
|
.Ed
|
|
.Pp
|
|
This example assumes that you have installed the correct debug kernel at
|
|
.Pa /var/crash/kernel.debug .
|
|
If not, substitute the correct name of the debug kernel.
|
|
.Pp
|
|
To perform remote serial debugging,
|
|
link
|
|
.Pa /var/crash/.gdbinit.serial
|
|
to
|
|
.Pa /var/crash/.gdbinit
|
|
and enter
|
|
.Bd -literal
|
|
# cd /var/crash
|
|
# gdb -k kernel.debug
|
|
.Ed
|
|
.Pp
|
|
In this case, the
|
|
.Pa .gdbinit
|
|
file performs the functions necessary to establish connection. The remote
|
|
machine must already be in debug mode: enter the kernel debugger and select
|
|
.Nm gdb .
|
|
The serial
|
|
.Pa .gdbinit
|
|
file expects the serial connection to run at 38400 bits per second; if you run
|
|
at a different speed, edit the file accordingly (look for the
|
|
.Ar remotebaud
|
|
specification).
|
|
.Pp
|
|
The following example shows a remote debugging session using the
|
|
.Ar debug
|
|
command of
|
|
.Xr vinum 8 :
|
|
.if t .ps -3
|
|
.if t .vs -3
|
|
.Bd -literal
|
|
GDB 4.16 (i386-unknown-freebsd), Copyright 1996 Free Software Foundation, Inc.
|
|
Debugger (msg=0xf1093174 "vinum debug") at ../../i386/i386/db_interface.c:318
|
|
318 in_Debugger = 0;
|
|
#1 0xf108d9bc in vinumioctl (dev=0x40001900, cmd=0xc008464b, data=0xf6dedee0 "",
|
|
flag=0x3, p=0xf68b7940) at
|
|
/usr/src/sys/modules/Vinum/../../dev/Vinum/vinumioctl.c:102
|
|
102 Debugger ("vinum debug");
|
|
(kgdb) bt
|
|
#0 Debugger (msg=0xf0f661ac "vinum debug") at ../../i386/i386/db_interface.c:318
|
|
#1 0xf0f60a7c in vinumioctl (dev=0x40001900, cmd=0xc008464b, data=0xf6923ed0 "",
|
|
flag=0x3, p=0xf688e6c0) at
|
|
/usr/src/sys/modules/vinum/../../dev/vinum/vinumioctl.c:109
|
|
#2 0xf01833b7 in spec_ioctl (ap=0xf6923e0c) at ../../miscfs/specfs/spec_vnops.c:424
|
|
#3 0xf0182cc9 in spec_vnoperate (ap=0xf6923e0c) at ../../miscfs/specfs/spec_vnops.c:129
|
|
#4 0xf01eb3c1 in ufs_vnoperatespec (ap=0xf6923e0c) at ../../ufs/ufs/ufs_vnops.c:2312
|
|
#5 0xf017dbb1 in vn_ioctl (fp=0xf1007ec0, com=0xc008464b, data=0xf6923ed0 "",
|
|
p=0xf688e6c0) at vnode_if.h:395
|
|
#6 0xf015dce0 in ioctl (p=0xf688e6c0, uap=0xf6923f84) at ../../kern/sys_generic.c:473
|
|
#7 0xf0214c0b in syscall (frame={tf_es = 0x27, tf_ds = 0x27, tf_edi = 0xefbfcff8,
|
|
tf_esi = 0x1, tf_ebp = 0xefbfcf90, tf_isp = 0xf6923fd4, tf_ebx = 0x2,
|
|
tf_edx = 0x804b614, tf_ecx = 0x8085d10, tf_eax = 0x36, tf_trapno = 0x7,
|
|
tf_err = 0x2, tf_eip = 0x8060a34, tf_cs = 0x1f, tf_eflags = 0x286,
|
|
tf_esp = 0xefbfcf78, tf_ss = 0x27}) at ../../i386/i386/trap.c:1100
|
|
#8 0xf020a1fc in Xint0x80_syscall ()
|
|
#9 0x804832d in ?? ()
|
|
#10 0x80482ad in ?? ()
|
|
#11 0x80480e9 in ?? ()
|
|
.Ed
|
|
.if t .vs
|
|
.if t .ps
|
|
.Pp
|
|
When entering from the debugger, it's important that the source of frame 1
|
|
(listed by the
|
|
.Pa .gdbinit
|
|
file at the top of the example) contains the text
|
|
.if t .ps -3
|
|
.if t .vs -3
|
|
.Bd -literal
|
|
Debugger ("vinum debug");
|
|
.Ed
|
|
.if t .vs
|
|
.if t .ps
|
|
.Pp
|
|
This is an indication that the address specifications are correct. If you get
|
|
some other output, your symbols and the kernel module are out of sync, and the
|
|
trace will be meaningless.
|
|
.El
|
|
.Pp
|
|
For an initial investigation, the most important information is the output of
|
|
the
|
|
.Nm bt
|
|
(backtrace) command above.
|
|
.Ss Reporting problems with Vinum
|
|
.Pp
|
|
If you find any bugs in
|
|
.Nm ,
|
|
please report them to Greg Lehey <grog@lemis.com>. Supply the following
|
|
information:
|
|
.Pp
|
|
.Bl -bullet
|
|
.It
|
|
The output of the
|
|
.Nm
|
|
.Cm list
|
|
command.
|
|
.It
|
|
Any messages printed in
|
|
.Pa /var/log/messages .
|
|
All such messages will be identified by the text
|
|
.Nm
|
|
at the beginning.
|
|
.It
|
|
If you have a panic, a stack trace as described above.
|
|
.El
|
|
.Sh AUTHORS
|
|
.An Greg Lehey Aq grog@lemis.com .
|
|
.Sh HISTORY
|
|
.Nm
|
|
first appeared in
|
|
.Fx 3.0 .
|
|
The RAID-5 component of
|
|
.Nm
|
|
was developed by Cybernet Inc.
|
|
.Pa www.cybernet.com
|
|
for its NetMAX product.
|
|
.Sh SEE ALSO
|
|
.Xr disklabel 5 ,
|
|
.Xr disklabel 8 ,
|
|
.Xr newfs 8 ,
|
|
.Xr vinum 8
|