BLOCKDEV
Section: System Administration (8)
Updated: August 2010
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NAME
blockdev - call block device ioctls from the command line
SYNOPSIS
blockdev
[-q]
[-v]
command
[command...]
device
[device...]
blockdev
--report
[device...]
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 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.
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 sectorsize in bytes - usually 512.
- --getsz
-
Get size in 512-byte sectors.
- --rereadpt
-
Reread partition table
- --setbsz bytes
-
Set blocksize.
- --setfra sectors
-
Set filesystem readahead (same like --setra on 2.6 kernels).
- --setra sectors
-
Set readahead (in 512-byte sectors).
- --setro
-
Set read-only.
- --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
ftp://ftp.kernel.org/pub/linux/utils/util-linux/.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- OPTIONS
-
- COMMANDS
-
- AUTHOR
-
- AVAILABILITY
-
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