blockdev
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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.

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