NAME

blktool - Display or change block device settings

SYNOPSIS

blktool [options] device [acoustic-mgmt nnn]

blktool [options] device [block-sz nnn]

blktool [options] device [bus-id]

blktool [options] device [bus-state nnn]

blktool [options] device [class]

blktool [options] device [cd-speed nnn]

blktool [options] device [defect-mgmt off|on]

blktool [options] device [dev-keep-settings off|on]

blktool [options] device [dev-read-ahead off|on]

blktool [options] device [dma off|on]

blktool [options] device [geometry]

blktool [options] device [i2o-rcache nnn]

blktool [options] device [i2o-wcache nnn]

blktool [options] device [id]

blktool [options] device [keep-settings off|on]

blktool [options] device [media unlock|lock]

blktool [options] device [multiple-count nnn]

blktool [options] device [no-write-err off|on]

blktool [options] device [pio-data 16-bit|32-bit]

blktool [options] device [pio-mode nnn]

blktool [options] device [pm-mode nnn]

blktool [options] device [queue-depth nnn]

blktool [options] device [read-ahead nnn]

blktool [options] device [readonly off|on]

blktool [options] device [reread-part]

blktool [options] device [reset]

blktool [options] device [sector-sz]

blktool [options] device [sleep]

blktool [options] device [standby]

blktool [options] device [unmask-irq off|on]

blktool [options] device [version]

blktool [options] [version]

blktool [options] device [wcache off|on]

DESCRIPTION

blktool is used for querying and/or changing settings of a block device.

device is the name of the block device to query or modify.

OPTIONS

-f

For a few commands, blktool will flush the buffers of the block device out to disk, before performing the requested command. Specify this option, "force", disables any flushing blktool would attempt to do.

-t class

where class is one of 'ide', 'ata', 'scsi', 'i2o', or 'auto' to override the default auto-detection of device class.

COMMANDS

acoustic-mgmt

Query or set underlying device's acoustic level.

block-sz

Query or set device block size.

bus-id

Query device bus id.

bus-state

Query or set device bus state (0 off, 1 on, 2 tristate)

class

Query the detected (or overridden, via -t) device class. Typically this will result in 'ATA' or 'SCSI' for most devices. Detection is based on device major; thus your SATA device may appear as 'SCSI'.

cd-speed

Set CD-ROM device speed (in Kbytes/sec).

defect-mgmt

Toggle underlying device's defect management (obsolete).

dev-keep-settings

Toggle underlying device's revert-to-defaults-on-reset feature.

dev-read-ahead

Toggle underlying device's read-ahead feature.

dma

Toggle DMA data transfer. Omitting the on/off argument will print the current state.

geometry

Query device geometry (cylinders / heads / sectors / etc.).

i2o-rcache

Query or set an I2O block device's read cache.

i2o-wcache

Query or set an I2O block device's write cache.

id

Query IDENTIFY [PACKET] DEVICE data.

keep-settings

Keep settings across device resets. Omitting the on/off argument will print the current state.

media

Lock in (or unlock) a removable device.

multiple-count

Set multiple count for use in READ/WRITE MULTIPLE commands.

no-write-err

Toggle ignore-write-errors flag. Omitting the on/off argument will print the current state.

pio-data

ATA PIO data transfer via 16-bit or 32-bit I/O. Omitting the on/off argument will print the current state.

pio-mode

Set underlying ATA device's PIO data transfer mode.

pm-mode

Set underlying device's Advanced Power Management mode.

queued-depth

Query or set underlying device's queue depth.

read-ahead

Query or set block device read-ahead (in units of sectors).

readonly

Toggle block device read-only setting. Omitting the on/off argument will print the current state.

reread-part

Re-read partition table.

reset

Execute device reset.

sector-sz

Query device sector size.

sleep

Put device to sleep immediately.

standby

Put device in standby mode.

unmask-irq

Toggle unmasked irqs. Omitting the on/off argument will print the current state.

version

Print version number and exit.

wcache

Toggle underlying device's writeback cache.

BUGS

Inevitably there are some. Please report any you find.

AUTHOR

blktool was written by Jeff Garzik.

AVAILABILITY

blktool is available over the Web on the SourceForge site at http://sourceforge.net/projects/gkernel/