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 al

lows 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 versions 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 man

agement device
will be enabled and will allow Linux-based management appli

cations 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 de

termines the
maximum data transfer size allowed to/from an array. Set

ting it higher
will result in better performance, especially for large se

quential 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 performance 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
+o HP NetRAID 4M

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 asynchronous

ly 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.

BSD January 4, 2005

BSD