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/.

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