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       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
       available from

                                   Jun 2007