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BLOCKDEV(8)									      BLOCKDEV(8)

NAME
       blockdev - call block device ioctls from the command line

SYNOPSIS
       blockdev [-q] [-v] command [command...]	device [device...]
       blockdev --report [device...]

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 the specified device. It is possible to give multiple devices.
	      If none is given, all devices which appear in /proc/partitions are shown. Note that
	      the partition StartSec is in 512-byte sectors.

COMMANDS
       It is possible to give multiple devices and multiple commands.

       --flushbufs
	      Flush buffers.

       --getalignoff
	      Get alignment offset.

       --getbsz
	      Print blocksize in bytes.

       --getdiscardzeroes
	      Get discard zeroes support status.

       --getfra
	      Get filesystem readahead in 512-byte sectors.

       --getiomin
	      Get minimum I/O size.

       --getioopt
	      Get optimal I/O size.

       --getmaxsect
	      Get max sectors per request

       --getpbsz
	      Get physical block (sector) size.

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

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

       --getsize64
	      Print device size in bytes.

       --getsize
	      Print device size (32-bit!) in sectors. Deprecated in favor of the --getsz option.

       --getss
	      Print sectorsize in bytes - usually 512.

       --getsz
	      Get size in 512-byte sectors.

       --rereadpt
	      Reread partition table

       --setbsz bytes
	      Set blocksize.

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

       --setra sectors
	      Set readahead (in 512-byte sectors).

       --setro
	      Set read-only.

       --setrw
	      Set read-write.

AUTHOR
       blockdev was written by Andries E. Brouwer and rewritten by Karel Zak.

AVAILABILITY
       The   blockdev	command  is  part  of  the  util-linux	package  and  is  available  from
       ftp://ftp.kernel.org/pub/linux/utils/util-linux/.

					     Aug 2010				      BLOCKDEV(8)
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