atacontrol(8)

NAME

atacontrol - ATA device driver control program

SYNOPSIS

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

DESCRIPTION

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 physi

cally 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 num

ber of sectors. 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 possible 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
SPAN.

delete Delete a RAID array on a RAID capable ATA con

troller.

addspare

Add a spare disk to an existing RAID.

rebuild Rebuild a RAID1 array on a RAID capable ATA con

troller.

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 sup

ported by the
hardware. Modes are given like ``PIO3'', ``ud

ma2'',
``udma100'', case does not matter.

Currently supported modes are: PIO0, PIO1, PIO2,

PIO3

WDMA2, UDMA2 (alias UDMA33), UDMA4 (alias UDMA66),

UDMA5

UDMA100) and UDMA6 (alias UDMA133). The device

name and manufacture/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.

EXAMPLES

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

command
line:

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
example:

atacontrol mode ad0 PIO4

The new modes are set as soon as the atacontrol command re

turns.

SEE ALSO

ata(4)

HISTORY

The atacontrol utility first appeared in FreeBSD 4.6.

AUTHORS

The atacontrol utility was written by Soren Schmidt

<sos@FreeBSD.org>.

This manual page was written by Soren Schmidt <sos@FreeB

SD.org>.

BSD August 16, 2005

BSD