GNU/Linux man pages
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GNU/Linux |
Debian 7.2.0(Wheezy) |
amd64 |
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blockdev(8) |
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blockdev − call block device ioctls from the command line
blockdev
[−q] [−v] command
[command...] device [device...]
blockdev −−report [device...]
The utility blockdev allows one to call block device ioctls from the command line.
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−V |
Print version and exit. |
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−q |
Be quiet. |
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−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.
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.
blockdev was written by Andries E. Brouwer and rewritten by Karel Zak.
The blockdev command is part of the util-linux package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux/.
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blockdev(8) | |