Dr Andrew Scott G7VAV

My photo
 
March 2024
Mo Tu We Th Fr Sa Su
26 27 28 29 1 2 3
4 5 6 7 8 9 10
11 12 13 14 15 16 17
18 19 20 21 22 23 24
25 26 27 28 29 30 31
1 2 3 4 5 6 7


BLOCKDEV

Section: System Administration (8)
Updated: August 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


for client 44.222.146.114
© Andrew Scott 2006 - 2024,
All Rights Reserved
http://www.andrew-scott.uk/
Andrew Scott
http://www.andrew-scott.co.uk/