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BLOCKDEV(8)                 System Manager's Manual                BLOCKDEV(8)



NAME
       blockdev - call block device ioctls from the command line

SYNOPSIS
       blockdev [options] commands devices

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.

COMMANDS
       --setro
              Set read-only.

       --setrw
              Set read-write.

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

       --getss
              Print sectorsize in bytes - usually 512.

       --getsize
              Print device capacity (in 512-byte sectors).

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

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

       --flushbufs
              Flush buffers.

       --rereadpt
              Reread partition table.



                                   May 2000                        BLOCKDEV(8)