BLOCKDEV(8)                                                                                                          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.  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.ker-
       nel.org/pub/linux/utils/util-linux-ng/.




                                                            Jun 2007                                                 BLOCKDEV(8)