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BLOCKDEV(8)									      BLOCKDEV(8)

       blockdev - call block device ioctls from the command line

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

       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 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.

       It is possible to give multiple devices and multiple commands.

	      Flush buffers.

	      Get alignment offset.

	      Print blocksize in bytes.

	      Get discard zeroes support status.

	      Get filesystem readahead in 512-byte sectors.

	      Get minimum I/O size.

	      Get optimal I/O size.

	      Get max sectors per request

	      Get physical block (sector) size.

	      Print readahead (in 512-byte sectors).

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

	      Print device size in bytes.

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

	      Print sectorsize in bytes - usually 512.

	      Get size in 512-byte sectors.

	      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).

	      Set read-only.

	      Set read-write.

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

       The   blockdev	command  is  part  of  the  util-linux	package  and  is  available  from

					     Aug 2010				      BLOCKDEV(8)
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