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blockdev

call block device ioctls from the command line


  1. blockdev.8.man


1. blockdev.8.man

Manpage of BLOCKDEV

BLOCKDEV

Section: Maintenance Commands (8)
Updated: Aug 2010
Index Return to Main Contents
 

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/.


 

Index

NAME
SYNOPSIS
DESCRIPTION
OPTIONS
COMMANDS
AUTHOR
AVAILABILITY

This document was created by man2html using the manual pages.
Time: 17:30:24 GMT, October 23, 2013

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