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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	addspare raid disk
     atacontrol	rebuild	raid
     atacontrol	status raid
     atacontrol	mode device
     atacontrol	info channel
     atacontrol	cap 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 ATA channel device (e.g., ata0) on which to
     operate.  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, SPAN or 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.

	      Add a spare disk to an existing RAID.

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

     status   Get the status of	an ATA RAID.

     mode     Without the mode argument, the current transfer modes of the
	      device are printed.  If the mode argument	is given, the ATA
	      driver is	asked to change	the transfer mode to the one 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.

	      Currently	supported modes	are: PIO0, PIO1, PIO2, PIO3, PIO4,
	      WDMA2, UDMA2 (alias UDMA33), UDMA4 (alias	UDMA66), UDMA5 (alias
	      UDMA100) and UDMA6 (alias	UDMA133).  The device name and manu-
	      facture/version strings are shown.

     cap      Show detailed info about the device on device.

     info     Show info	about the attached devices on the channel.

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

     To	get information	on devices attached to a channel, use the command

	   atacontrol info ata0

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

	   atacontrol mode ad0

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

	   current mode	= UDMA100

     You can set the mode with atacontrol and a	string like the	above, for

	   atacontrol mode ad0 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	6.1			August 16, 2005			   FreeBSD 6.1


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