Manual Reference Pages  - BLOCKDEV (8)

NAME
blockdev - call block device ioctls from the command line

CONTENTS

Synopsis
Description
Options
Commands
Author
Availability

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/.

util-linux BLOCKDEV (8) August 2010
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