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aac(4)

NAME

     aac -- Adaptec AdvancedRAID Controller driver

SYNOPSIS

     options AAC_DEBUG=N
     device pci
     device aac
     device aacp

DESCRIPTION

     The aac driver provides support for the Adaptec AAC family of SCSI
     Ultra2, Ultra160, and Ultra320, and SATA RAID controllers.

     Access to RAID containers is available via the /dev/aacd? device nodes.
     The aacp device enables the SCSI pass-thru interface and allows devices
     connected to the card such as CD-ROMs to be available via the CAM scsi(4)
     subsystem.  Note that not all cards allow this interface to be enabled.

     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 compatibilty with the Dell and HP ver-
     sions of management tools, respectively.  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 allow Linux-based management applications to
     control the card.

   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.

HARDWARE

     Controllers supported by the aac driver include:

     o	 Adaptec AAC-364
     o	 Adaptec SATA RAID 2410SA
     o	 Adaptec SATA RAID 2810SA
     o	 Adaptec SATA RAID 21610SA
     o	 Adaptec SCSI RAID 2120S
     o	 Adaptec SCSI RAID 2130S
     o	 Adaptec SCSI RAID 2200S
     o	 Adaptec SCSI RAID 2130SLP
     o	 Adaptec SCSI RAID 2230SLP
     o	 Adaptec SCSI RAID 5400S
     o	 Dell CERC SATA RAID 2
     o	 Dell PERC 2/Si
     o	 Dell PERC 2/QC
     o	 Dell PERC 3/Si
     o	 Dell PERC 3/Di
     o	 Dell PERC 320/DC
     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), scsi(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 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.

FreeBSD 5.4			January 4, 2005 		   FreeBSD 5.4

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