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blktool

man page of blktool

blktool: Display or change block device settings

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 //sourceforge.net/projects/gkernel/ BLKTOOL(8)
 
 
 

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