blockdev man page on CentOS

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BLOCKDEV(8)							   BLOCKDEV(8)

NAME
       blockdev - call block device ioctls from the command line

SYNOPSIS
       blockdev [options] commands 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.

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.

       --getsz
	      Get size in 512-byte sectors.

       --getsize
	      Print device size (in 512-byte sectors).

       --getsize64
	      Print device size in bytes.

       --setra N
	      Set readahead to N 512-byte sectors.

       --getra
	      Print readahead (in 512-byte sectors).

       --flushbufs
	      Flush buffers.

       --rereadpt
	      Reread partition table.

       --rmpart N
	      remove selected partition from kernel. (DEPRECATED)

       --rmparts
	      remove all device partitions from kernel. (DEPRECATED)

       --report [<device> ...]
	      print read-only status, block size, sector size and geometry for
	      all devices (according to /proc/partitions) or for given devices
	      only. This command cannot be used together with other  commands.
	      (DEPRECATED)

				   May 2000			   BLOCKDEV(8)
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