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blockdev

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blockdev: call block device ioctls from the command line

NAME

blockdev - call block device ioctls from the command line

SYNOPSIS

blockdev [-q] [-v] command [command...] device [device...] blockdev --report [device...]
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. --report Print a report for the specified device. It is possible to give multiple devices. If none is given, all devices which appear in /proc/partitions are shown. Note that the partition StartSec is in 512-byte sectors.

COMMANDS

It is possible to give multiple devices and multiple commands. --flushbufs Flush buffers. --getalignoff Get alignment offset. --getbsz Print blocksize in bytes. --getdiscardzeroes Get discard zeroes support status. --getfra Get filesystem readahead in 512-byte sectors. --getiomin Get minimum I/O size. --getioopt Get optimal I/O size. --getmaxsect Get max sectors per request --getpbsz Get physical block (sector) size. --getra Print readahead (in 512-byte sectors). --getro Get read-only. Print 1 if the device is read-only, 0 otherwise. --getsize64 Print device size in bytes. --getsize Print device size (32-bit!) in sectors. Deprecated in favor of the --getsz option. --getss Print sectorsize in bytes - usually 512. --getsz Get size in 512-byte sectors. --rereadpt Reread partition table --setbsz bytes Set blocksize. --setfra sectors Set filesystem readahead (same like --setra on 2.6 kernels). --setra sectors Set readahead (in 512-byte sectors). --setro Set read-only. --setrw Set read-write.

AUTHOR

blockdev was written by Andries E. Brouwer and rewritten by Karel Zak.

AVAILABILITY

The blockdev command is part of the util-linux package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux/. Aug 2010 BLOCKDEV(8)
 
 
 

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