Skip site navigation (1)Skip section navigation (2)

FreeBSD Manual Pages


home | help
ATACONTROL(8)           FreeBSD System Manager's Manual          ATACONTROL(8)

     atacontrol -- ATA device driver control program

     atacontrol <command> args

     atacontrol attach channel
     atacontrol detach channel
     atacontrol reinit channel
     atacontrol create type [interleave] disk0 ... diskN
     atacontrol delete raid
     atacontrol rebuild raid
     atacontrol status raid
     atacontrol mode channel [mastermode slavemode]
     atacontrol info channel
     atacontrol cap channel device
     atacontrol enclosure channel device
     atacontrol list

     The atacontrol utility is a control program that provides the user access
     and control to the FreeBSD ata(4) subsystem.

     The atacontrol utility can cause severe system crashes and loss of data
     if used improperly.  Please exercise caution when using this command!

     The channel argument is the number of the ATA channel on which to oper-
     ate.  The following commands are supported:

     attach   Attach an ATA channel.  Devices on the channel are probed and
              attached as is done on boot.

     detach   Detach an ATA channel.  Devices on the channel are removed from
              the kernel, and all outstanding transfers etc. are returned back
              to the system marked as failed.

     reinit   Reinitialize an ATA channel.  Both devices on the channel are
              reset and initialized to the parameters the ATA driver has
              stored internally.  Devices that have gone bad and no longer
              respond to the probe, or devices that have physically been
              removed, are removed from the kernel.  Likewise are devices that
              show up during a reset, probed and attached.

     create   Create a type ATA RAID.  The type can be RAID0 (stripe), RAID1
              (mirror), RAID0+1 or SPAN (JBOD).  In case the RAID has a RAID0
              component, the interleave must be specified in number of sec-
              tors.  The RAID will be created of the individual disks named
              disk0 ... diskN.

              Although the ATA driver allows for creating an ATA RAID on disks
              with any controller, there are restrictions.  It is only possi-
              ble to boot on an array if it is either located on a ``real''
              ATA RAID controller like the Promise or Highpoint controllers,
              or if the RAID declared is of RAID1 or SPAN type; in case of a
              SPAN, the partition to boot must reside on the first disk in the

     delete   Delete a RAID array on a RAID capable ATA controller.

     rebuild  Rebuild a RAID1 array on a RAID capable ATA controller.

     status   Get the status of an ATA RAID.

     mode     Without the two mode arguments, the current transfer modes of
              both devices are printed.  If the mode arguments are given, the
              ATA driver is asked to change the transfer modes to those given.
              The ATA driver will reject modes that are not supported by the
              hardware.  Modes are given like ``PIO3'', ``udma2'',
              ``udma100'', case does not matter.  If one of the devices mode
              should not be changed, use a nonexisting mode as argument (i.e.
              ``XXX''), and the mode will remain unchanged.

              Currently supported modes are: BIOSDMA, PIO0 (alias BIOSPIO),
              PIO1, PIO2, PIO3, PIO4, WDMA2, UDMA2 (alias UDMA33), UDMA4
              (alias UDMA66), UDMA5 (alias UDMA100) and UDMA6 (alias UDMA133).

     info     Show info about the attached devices on the channel.  The device
              name and manufacture/version strings are shown.

     cap      Show detailed info about the device on channel device where
              device is 0 for master and 1 for slave.

              Show detailed info about the enclosure on channel device where
              device is 0 for master and 1 for slave.  Fan RPM speed, enclo-
              sure temperature, 5V and 12V levels are shown.

     list     Show info about all attached devices on all active controllers.

     To see the devices' current access modes, use the command line:

           atacontrol mode 0

     which results in the modes of the devices being displayed as a string
     like this:

           Master = WDMA2
           Slave  = PIO4

     This means that ata0-master is in DMA mode, ata0-slave is in PIO mode,
     and so forth.  You can set the mode with atacontrol and a string like the
     above, for example:

           atacontrol mode 0 PIO4 PIO4

     The new modes are set as soon as the atacontrol command returns.


     The atacontrol utility first appeared in FreeBSD 4.6.

     The atacontrol utility was written by Soren Schmidt <>.

     This manual page was written by Soren Schmidt <>.

FreeBSD 4.10                     May 17, 2001                     FreeBSD 4.10


Want to link to this manual page? Use this URL:

home | help