aac -- Adaptec AdvancedRAID Controller driver
The aac driver provides support for the Adaptec AAC family of SCSI
Ultra2, Ultra160, and Ultra320 RAID controllers. Supported controllers
+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 vendors
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
allow 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.
Tuning [Toc] [Back]
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 performance
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
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.
kld(4), linux(4), scsi(4), kldload(8), loader(8), sysctl(8)
The aac driver first appeared in FreeBSD 4.3.
Mike Smith <msmith@FreeBSD.org>
Scott Long <scottl@FreeBSD.org>
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 5.2.1 February 22, 2001 FreeBSD 5.2.1 [ Back ]