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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.  Note that the block size is specific to the current file descriptor opening
              the block device, so the change of block size only persists for as long as blockdev has the device open,
              and is lost once blockdev exits.

              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  available  from  ftp://ftp.ker-

                                   Jun 2007                        BLOCKDEV(8)