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
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