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.

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/.