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blockdev

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 R devices .

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.
I --setbsz N
Set blocksize to N bytes.
--getsize
Print device size in sectors.
--getsize64
Print device size in bytes.
I --setra N
Set readahead to N 512-byte sectors.
--getra
Print readahead (in 512-byte sectors).
I --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/.