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

     aac -- Adaptec AdvancedRAID Controller driver

     options AAC_COMPAT_LINUX
     options AAC_DEBUG=N
     device pci
     device aac

     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

     +o   AAC-364

     +o   Adaptec SCSI RAID 2120S

     +o   Adaptec SCSI RAID 2200S

     +o   Adaptec SCSI RAID 2410SA

     +o   Adaptec SCSI RAID 2810SA

     +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

     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

     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
     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), 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 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 4.10                   February 22, 2001                  FreeBSD 4.10


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