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AAC(4)		       FreeBSD Kernel Interfaces Manual			AAC(4)

NAME
     aac -- Adaptec AdvancedRAID Controller driver

SYNOPSIS
     options AAC_COMPAT_LINUX
     options AAC_DEBUG=N
     device pci
     device aac

DESCRIPTION
     The aac driver provides support for the Adaptec AAC family	SCSI Ultra2
     and Ultra160 RAID controllers.  These controllers support RAID 0, 1, 5,
     10, and volume sets.  They	have four channels in the add-in version or
     1-2 channels in the motherboard integrated	version, and are most often
     found relabeled by	Dell or	Hewlett-Packard.  Supported controllers
     include:

     +o	 AAC-364

     +o	 Adaptec SCSI RAID 5400S

     +o	 HP NetRAID 4M

     +o	 Dell PERC 2/Si

     +o	 Dell PERC 2/QC

     +o	 Dell PERC 3/Si

     +o	 Dell PERC 3/Di

     Access to RAID containers is available via	the /dev/aacd? device nodes.
     Individual	drives cannot be accessed unless they are part of a container
     or	volume set, and	non-fixed disks	cannot be accessed.  Containers	can be
     configured	by using either	the on-board BIOS utility of the card, or a
     Linux-based management application.

     The /dev/aac? device nodes	provide	access to the management interface of
     the controller.  One node exists per installed card.  The aliases
     /dev/afa? and /dev/hpn? exist for the Dell	and HP flavors,	respectively,
     and are required for the CLI management utility available from these ven-
     dors to work.  Compiling the driver with the AAC_COMPAT_LINUX option
     enables the Linux-compatible ioctl(2) interface for the management
     device.

   Tuning
     The read-only sysctl hw.aac.iosize_max defaults to	65536 and may be set
     at	boot time to another value via loader(8).  This	value determines the
     maximum data transfer size	allowed	to/from	an array.  Setting it higher
     will result in better performance,	especially for large sequential	access
     patterns.	Beware:	internal limitations of	the card limit this value to
     64K for arrays with many members.	While it may be	safe to	raise this
     value, this is done at the	operator's own risk.  Note also	that perfor-
     mance peaks at a value of 96K, and	drops off dramatically at 128K,	due to
     other limitations of the card.

FILES
     /dev/aac?		  aac management interface
     /dev/aacd?		  disk/container interface
     /boot/kernel/aac.ko  aac loadable module

DIAGNOSTICS
     Compiling with AAC_DEBUG set to a number between 0	and 3 will enable
     increasingly verbose debug	messages.

     The adapter can send status and alert messages asynchronously to the
     driver.  These messages are printed on the	system console,	and are	also
     queued for	retrieval by a management application.

SEE ALSO
     kld(4), linux(4), kldload(8), loader(8), sysctl(8)

HISTORY
     The aac driver first appeared in FreeBSD 4.3.

AUTHORS
     Mike Smith	<msmith@FreeBSD.org>
     Scott Long	<scottl@FreeBSD.org>

BUGS
     This driver is not	compatible with	controllers that have version 1.x
     firmware.	The firmware version is	the same as the	kernel version printed
     in	the BIOS POST and driver attach	messages.

     This driver will not work on systems with more than 4GB of	memory.

     The controller is not actually paused on suspend/resume.

     Unloading driver is not supported at this time.

FreeBSD	10.1		       February	22, 2001		  FreeBSD 10.1

NAME | SYNOPSIS | DESCRIPTION | FILES | DIAGNOSTICS | SEE ALSO | HISTORY | AUTHORS | BUGS

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