blockdev man page on aLinux

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BLOCKDEV(8)							   BLOCKDEV(8)

       blockdev - call block device ioctls from the command line

       blockdev [options] commands devices
       blockdev --report [devices]

       The  utility  blockdev  allows one to call block device ioctls from the
       command line.

       -V     Print version and exit.

       -q     Be quiet.

       -v     Be verbose.

	      Print a report for devices.  Note that the partition StartSec is
	      in 512-byte sectors.

	      Set read-only.

	      Set read-write.

	      Get read-only. Print 1 if the device is read-only, 0 otherwise.

	      Print sectorsize in bytes - usually 512.

	      Print blocksize in bytes.

       --setbsz N
	      Set blocksize to N bytes.

	      Print  device  size in sectors (BLKGETSIZE). Deprecated in favor
	      of the --getsz option.

	      Print device size in bytes (BLKGETSIZE64)

	      Get size in 512-byte sectors (BLKGETSIZE64 / 512).

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

	      Print readahead (in 512-byte sectors).

       --setfra N
	      Set filesystem readahead (same like --setra on 2.6 kernels).

	      Get filesystem readahead.

	      Flush buffers.

	      Reread partition table.

       blockdev was written by Andries E. Brouwer.

       The blockdev command is part of the util-linux-ng package and is availā€
       able from

				   Jun 2007			   BLOCKDEV(8)

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