BLOCKDEV(8) System Manager's Manual BLOCKDEV(8)NAME
blockdev - call block device ioctls from the command line
SYNOPSIS
blockdev [options] commands devices
blockdev --report [devices]
DESCRIPTION
The utility blockdev allows one to call block device ioctls from the command line.
OPTIONS -V Print version and exit.
-q Be quiet.
-v Be verbose.
--report
Print a report for devices. Note that the partition StartSec is in 512-byte sectors.
COMMANDS --setro
Set read-only.
--setrw
Set read-write.
--getro
Get read-only. Print 1 if the device is read-only, 0 otherwise.
--getss
Print sectorsize in bytes - usually 512.
--getbsz
Print blocksize in bytes.
--setbsz N
Set blocksize to N bytes.
--getsize
Print device size in sectors (BLKGETSIZE). Deprecated in favor of the --getsz option.
--getsize64
Print device size in bytes (BLKGETSIZE64)
--getsz
Get size in 512-byte sectors (BLKGETSIZE64 / 512).
--setra N
Set readahead to N 512-byte sectors.
--getra
Print readahead (in 512-byte sectors).
--setfra N
Set filesystem readahead (same like --setra on 2.6 kernels).
--getfra
Get filesystem readahead.
--flushbufs
Flush buffers.
--rereadpt
Reread partition table.
AUTHOR
blockdev was written by Andries E. Brouwer.
AVAILABILITY
The blockdev command is part of the util-linux-ng package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux-ng/.
Jun 2007 BLOCKDEV(8)
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BLOCKDEV(8) System Administration BLOCKDEV(8)NAME
blockdev - call block device ioctls from the command line
SYNOPSIS
blockdev [-q] [-v] command [command...] device [device...]
blockdev --report [device...]
blockdev -h|-V
DESCRIPTION
The utility blockdev allows one to call block device ioctls from the command line.
OPTIONS -q Be quiet.
-v Be verbose.
--report
Print a report for the specified device. It is possible to give multiple devices. If none is given, all devices which appear in
/proc/partitions are shown. Note that the partition StartSec is in 512-byte sectors.
-h, --help
Display help text and exit.
-V, --version
Print version and exit.
COMMANDS
It is possible to give multiple devices and multiple commands.
--flushbufs
Flush buffers.
--getalignoff
Get alignment offset.
--getbsz
Print blocksize in bytes.
--getdiscardzeroes
Get discard zeroes support status.
--getfra
Get filesystem readahead in 512-byte sectors.
--getiomin
Get minimum I/O size.
--getioopt
Get optimal I/O size.
--getmaxsect
Get max sectors per request
--getpbsz
Get physical block (sector) size.
--getra
Print readahead (in 512-byte sectors).
--getro
Get read-only. Print 1 if the device is read-only, 0 otherwise.
--getsize64
Print device size in bytes.
--getsize
Print device size (32-bit!) in sectors. Deprecated in favor of the --getsz option.
--getss
Print logical sector size in bytes - usually 512.
--getsz
Get size in 512-byte sectors.
--rereadpt
Reread partition table
--setbsz bytes
Set blocksize. Note that the block size is specific to the current file descriptor opening the block device, so the change of block
size only persists for as long as blockdev has the device open, and is lost once blockdev exits.
--setfra sectors
Set filesystem readahead (same like --setra on 2.6 kernels).
--setra sectors
Set readahead (in 512-byte sectors).
--setro
Set read-only. The currently active access to the device may not be affected by the change. For example filesystem already mounted
in read-write mode will not be affected. The change applies after remount.
--setrw
Set read-write.
AUTHOR
blockdev was written by Andries E. Brouwer and rewritten by Karel Zak.
AVAILABILITY
The blockdev command is part of the util-linux package and is available from https://www.kernel.org/pub/linux/utils/util-linux/.
util-linux August 2010 BLOCKDEV(8)