161 lines
4.7 KiB
Groff
161 lines
4.7 KiB
Groff
.\" Copyright (c) 2000 Scott Long
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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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.\"
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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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.\" $FreeBSD$
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.Dd February 22, 2001
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.Dt AAC 4
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.Os
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.Sh NAME
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.Nm aac
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.Nd Adaptec AdvancedRAID Controller driver
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.Sh SYNOPSIS
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.Cd options AAC_COMPAT_LINUX
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.Cd options AAC_DEBUG=N
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.Cd device pci
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.Cd device aac
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.Sh DESCRIPTION
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The
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.Nm
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driver provides support for the Adaptec AAC family SCSI Ultra2 and Ultra160
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RAID controllers.
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These controllers support RAID 0, 1, 5, 10, and volume sets.
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They have four channels in the add-in version
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or 1-2 channels in the motherboard integrated version,
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and are most often found relabeled by Dell or Hewlett-Packard.
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Supported controllers include:
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.Bl -bullet
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.It
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AAC-364
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.It
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AAC-3642
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.It
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HP NetRAID 4M
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.It
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Dell PERC 2/Si
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.It
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Dell PERC 2/QC
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.It
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Dell PERC 3/Si
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.It
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Dell PERC 3/Di
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.Pp
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.El
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Access to RAID containers is available via the
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.Pa /dev/aacd?
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device nodes.
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Individual drives cannot be accessed
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unless they are part of a container or volume set,
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and non-fixed disks cannot be accessed.
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Containers can be configured by using
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either the on-board BIOS utility of the card,
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or a Linux-based management application.
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.Pp
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The
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.Pa /dev/aac?
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device nodes provide access to the management interface of the controller.
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One node exists per installed card.
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The aliases
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.Pa /dev/afa?
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and
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.Pa /dev/hpn?
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exist for the Dell and HP flavors, respectively, and are required for
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the CLI management utility available from these vendors to work.
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Compiling the driver with the
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.Dv AAC_COMPAT_LINUX
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option enables the Linux-compatible
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.Xr ioctl 2
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interface for the management device.
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The
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.Xr ioctl 2
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command set is heavily tailored to existing Linux applications.
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Native
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.Xr ioctl 2
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support is not present at this time.
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.Ss Tuning
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The read-only sysctl
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.Va hw.aac.iosize_max
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defaults to 65536 and may be set at boot time to another value via
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.Xr loader 8 .
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This value determines the maximum data transfer size allowed
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to/from an array.
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Setting it higher will result in better performance,
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especially for large sequential access patterns.
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.Em Beware :
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internal limitations
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of the card limit this value to 64K for arrays with many members.
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While it may be safe to raise this value, this is done
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.Em at the operator's own risk .
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Note also that
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performance peaks at a value of 96K,
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and drops off dramatically at 128K,
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due to other limitations of the card.
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.Sh FILES
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.Bl -tag -width /boot/kernel/aac.ko -compact
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.It Pa /dev/aac?
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aac management interface
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.It Pa /dev/aacd?
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disk/container interface
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.It Pa /boot/kernel/aac.ko
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aac loadable module
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.El
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.Sh DIAGNOSTICS
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Compiling with
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.Dv AAC_DEBUG
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set to a number between 0 and 3
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will enable increasingly verbose debug messages.
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.Pp
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The adapter can send status and alert messages asynchronously
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to the driver.
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These messages are printed on the system console,
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and are also queued for retrieval by a management application.
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.Sh SEE ALSO
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.Xr kld 4 ,
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.Xr linux 4 ,
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.Xr kldload 8 ,
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.Xr loader 8 ,
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.Xr sysctl 8
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.Sh HISTORY
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The
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.Nm
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driver first appeared in
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.Fx 4.3
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and is
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.Ud
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.Sh AUTHORS
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.An Mike Smith
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.Aq msmith@FreeBSD.org
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.An Scott Long
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.Aq scottl@FreeBSD.org
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.Sh BUGS
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This driver has not been tested on Alpha, though it should work.
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.Pp
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The controller is not actually paused on suspend/resume.
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.Pp
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Adapter-initiated messages are not returned back to the controller,
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possibly causing a resource leak on the controller.
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.Pp
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Unloading and reloading the driver as a kernel loadable module
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without rebooting the system is strongly discouraged.
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.Pp
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