2fa4aaa07a
fixed variable so all manually-specified devices are shown rather then
cutting the display off at 3, fixed formatting for msps when msps is
larger then 100 (it was blowing the columner display output before),
added -K option to make blk count (-oIK) force a 1K block size (to conform
more closely to systat, vmstat definition of blocksize).
401 lines
11 KiB
Groff
401 lines
11 KiB
Groff
.\"
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.\" Copyright (c) 1997 Kenneth D. Merry.
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.\" All rights reserved.
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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. The name of the author may not be used to endorse or promote products
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.\" derived from this software without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $Id: iostat.8,v 1.5 1998/09/15 08:16:45 gibbs Exp $
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.\"
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.\" Copyright (c) 1985, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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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 the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University 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 BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)iostat.8 8.1 (Berkeley) 6/6/93
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.\"
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.Dd December 22, 1997
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.Dt IOSTAT 8
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.Os FreeBSD 3.0
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.Sh NAME
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.Nm iostat
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.Nd report
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.Tn I/O
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statistics
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.Sh SYNOPSIS
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.Nm iostat
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.Op Fl CdhKIoT?
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.Op Fl c Ar count
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.Op Fl M Ar core
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.Op Fl n Ar devs
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.Op Fl N Ar system
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.Op Fl t Ar type,if,pass
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.Op Fl w Ar wait
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.Op Ar drives
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.Sh DESCRIPTION
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.Nm Iostat
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displays kernel
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.Tn I/O
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statistics on terminal, device and cpu
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operations.
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.Pp
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The options are as follows:
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.Bl -tag -width flag
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.It Fl c
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Repeat the display
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.Ar count
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times. If no
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.Ar wait
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interval is specified, the default is 1 second.
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.It Fl C
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Display CPU statistics. This is on by default, unless
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.Fl d
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is specified.
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.It Fl d
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Display only device statistics. If this flag is turned on, only device
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statistics will be displayed, unless
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.Fl C
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or
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.Fl T
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is also specfied to enable the display of CPU or TTY statistics.
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.It Fl h
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Put iostat in
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.Sq top
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mode. In this mode, iostat will show devices in order from highest to
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lowest bytes per measurement cycle.
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.It Fl K
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In the blocks transfered display (-o), display block count in kilobytes rather
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then the device native block size.
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.It Fl I
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Display total statstics for a given time period, rather than average
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statistics for each second during that time period.
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.It Fl M
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Extract values associated with the name list from the specified core
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instead of the default
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.Dq Pa /dev/kmem .
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.It Fl n
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Display up to
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.Ar devs
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number of devices.
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.Nm iostat
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will display fewer devices if there aren't
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.Ar devs
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devices present.
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.It Fl N
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Extract the name list from the specified system instead of the default
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.Dq Pa /kernel .
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.It Fl o
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Display old-style
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.Nm iostat
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device statistics. Sectors per second, transfers per second, and miliseconds
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per seek are displayed. If
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.Fl I
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is specified, total blocks/sectors, total transfers, and
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miliseconds per seek are displayed.
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.It Fl t
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Specify which types of devices to display. There are three different
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categories of devices:
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.Bl -tag -width indent -compact
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.It device type:
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.Bl -tag -width 123456789 -compact
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.It da
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Direct Access devices
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.It sa
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Sequential Access devices
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.It printer
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Printers
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.It proc
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Processor devices
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.It worm
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Write Once Read Multiple devices
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.It cd
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CD devices
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.It scanner
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Scanner devices
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.It optical
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Optical Memory devices
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.It changer
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Medium Changer devices
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.It comm
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Communication devices
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.It array
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Storage Array devices
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.It enclosure
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Enclosure Services devices
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.It floppy
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Floppy devices
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.El
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.Pp
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.It interface:
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.Bl -tag -width 123456789 -compact
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.It IDE
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Integrated Drive Electronics devices
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.It SCSI
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Small Computer System Interface devices
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.It other
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Any other device interface
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.El
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.Pp
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.It passthrough:
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.Bl -tag -width 123456789 -compact
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.It pass
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Passthrough devices
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.El
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.El
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.Pp
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The user must specify at least one device type, and may specify at most
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one device type from each category. Multiple device types in a single
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device type statement must be separated by commas.
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.Pp
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Any number of
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.Fl t
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arguments may be specified on the command line. All
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.Fl t
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arguments are ORed together to form a matching expression against which
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all devices in the system are compared. Any device that fully matches
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any
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.Fl t
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argument will be included in the
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.Nm iostat
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output, up to the number of devices that can be displayed in
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80 columns, or the maximum number of devices specified by the user.
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.It Fl T
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Display TTY statistics. This is on by default, unless
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.Fl d
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is specified.
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.It Fl w
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Pause
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.Ar wait
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seconds between each display.
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If no repeat
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.Ar count
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is specified, the default is infinity.
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.It Fl ?
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Display a usage statement and exit.
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.El
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.Pp
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.Nm Iostat
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displays its information in the following format:
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.Bl -tag -width flag
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.It tty
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.Bl -tag -width indent -compact
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.It tin
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characters read from terminals
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.It tout
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characters written to terminals
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.El
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.It devices
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Device operations. The header of the field is the device name and unit number.
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.Nm iostat
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will display as many devices as will fit in a standard 80 column screen, or
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the maximum number of devices in the system, whichever is smaller. If
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.Fl n
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is specified on the command line, iostat will display the smaller of the
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requested number of devices, and the maximum number of devices in the system.
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To force
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.Nm iostat
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to display specific drives, their names may be supplied on the command
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line.
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.Nm iostat
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will not display more devices than will fit in an 80 column screen, unless
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the
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.Fl n
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argument is given on the command line to specify a maximum number of
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devices to display. If fewer devices are specified on the command line
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than will fit in an 80 column screen, iostat will show only the specified
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devices.
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.Pp
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The standard
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.Nm iostat
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device display shows the following statistics:
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.Pp
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.Bl -tag -width indent -compact
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.It KB/t
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kilobytes per transfer
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.It tps
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transfers per second
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.It MB/s
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megabytes per second
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.El
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.Pp
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The standard
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.Nm iostat
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device display, with the
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.Fl I
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flag specified, shows the following statistics:
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.Pp
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.Bl -tag -width indent -compact
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.It KB/t
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kilobytes per transfer
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.It xfrs
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total number of transfers
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.It MB
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total number of megabytes transferred
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.El
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.Pp
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The old-style
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.Nm iostat
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display (using
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.Fl o )
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shows the following statistics:
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.Pp
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.Bl -tag -width indent -compact
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.It sps
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sectors transferred per second
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.It tps
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transfers per second
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.It msps
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average milliseconds per transaction
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.El
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.Pp
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The old-style
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.Nm iostat
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display, with the
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.Fl I
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flag specified, shows the following statistics:
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.Pp
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.Bl -tag -width indent -compact
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.It blk
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total blocks/sectors transferred
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.It xfr
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total transfers
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.It msps
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average milliseconds per transaction
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.El
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.It cpu
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.Bl -tag -width indent -compact
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.It \&us
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% of cpu time in user mode
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.It \&ni
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% of cpu time in user mode running niced processes
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.It \&sy
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% of cpu time in system mode
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.It \&in
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% of cpu time in interrupt mode
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.It \&id
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% of cpu time in idle mode
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.El
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.El
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.Sh FILES
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.Bl -tag -width /dev/kmem -compact
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.It Pa /kernel
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Default kernel namelist.
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.It Pa /dev/kmem
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Default memory file.
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.El
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.Sh EXAMPLES
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.Dl iostat -w 1 da0 da1 cd0
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.Pp
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Display statistics for the first two Direct Access devices and the first
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CDROM device every second ad infinitum.
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.Pp
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.Dl iostat -c 2
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.Pp
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Display the statistics for the first four devices in the system twice, with
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a one second display interval.
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.Pp
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.Dl iostat -t da -t cd -w 1
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.Pp
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Display statistics for all CDROM and Direct Access devices every second
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ad infinitum.
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.Pp
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.Dl iostat -t da,scsi,pass -t cd,scsi,pass
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.Pp
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Display statistics once for all SCSI passthrough devices that provide access
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to either Direct Access or CDROM devices.
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.Pp
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.Dl iostat -h -n 8 -w 1
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.Pp
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Display up to 8 devices with the most I/O every second ad inifitum.
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.Pp
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.Dl iostat -dh -t da -w 1
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.Pp
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Omit the TTY and CPU displays, show devices in order of performance and
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show only Direct Access devices every second ad infinitum.
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.Pp
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.Dl iostat -Iw 3
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.Pp
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Display total statistics every three seconds ad infinitum.
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.Pp
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.Dl iostat -odICTw 2 -c 9
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.Pp
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Display total statistics using the old-style output format 9 times, with
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a two second interval between each measurement/display. The
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.Fl d
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flag generally disables the TTY and CPU displays, but since the
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.Fl T
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and
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.Fl C
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flags are given, the TTY and CPU displays will be displayed.
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.Sh SEE ALSO
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.Xr fstat 1 ,
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.Xr netstat 1 ,
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.Xr nfsstat 1 ,
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.Xr ps 1 ,
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.Xr systat 1 ,
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.Xr pstat 8 ,
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.Xr vmstat 8
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.Pp
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The sections starting with ``Interpreting system activity'' in
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.%T "Installing and Operating 4.3BSD" .
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.Sh HISTORY
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This version of
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.Nm iostat
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first appeared in
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.Fx 3.0 .
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.Sh BUGS
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.Pp
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You cannot display device statistics for a non-running system, due to the
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fact that the new device statistics interface is accessible only via
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.Xr sysctl 3 ,
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which does not provide a way to access non-running systems.
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.Sh AUTHOR
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.An Kenneth Merry Aq ken@FreeBSD.ORG
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