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AAC(4)			 BSD Kernel Interfaces Manual			AAC(4)

     aac -- Adaptec AdvancedRAID Controller driver

     options AAC_DEBUG=N
     device pci
     device aac
     device aacp

     The aac driver provides support for the Adaptec AAC family	of SCSI	Ul-
     tra2, Ultra160, and Ultra320 RAID controllers.  Supported controllers in-

     +o	 AAC-364

     +o	 Adaptec SCSI RAID 2120S

     +o	 Adaptec SCSI RAID 2200S

     +o	 Adaptec SCSI RAID 2410SA

     +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
     command-line interface 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.  If the kernel is compiled with the COMPAT_LINUX option, or
     the aac_linux.ko and linux.ko modules are loaded, the Linux-compatible
     ioctl(2) interface	for the	management device will be enabled and will al-
     low Linux-based management	applications to	control	the card.

     The aacp device enables the SCSI pass-thru	interface and allows devices
     connected to the card such	as cdroms to be	available via the CAM scsi(4)
     subsystem.	 Note that not all cards allow this interface to be enabled.

     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.

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

     Compiling with AAC_DEBUG set to a number between 0	and 3 will enable in-
     creasingly	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.

     kld(4), linux(4), scsi(4),	kldload(8), loader(8), sysctl(8)

     The aac driver first appeared in FreeBSD 4.3.

     Mike Smith	<>
     Scott Long	<>

     This driver is not	compatible with	Dell 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.

     The controller is not actually paused on suspend/resume.

BSD			       February	22, 2001			   BSD


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