• 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/.
  

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