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April, 26th. 2006:
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BLKDISCARD
Section: System Administration (8) Updated: July 2014 Index
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NAME
blkdiscard - discard sectors on a device
SYNOPSIS
blkdiscard
[options]
[ -o
offset]
[ -l
length]
device
DESCRIPTION
blkdiscard
is used to discard device sectors. This is useful for solid-state
drivers (SSDs) and thinly-provisioned storage. Unlike
fstrim(8),
this command is used directly on the block device.
By default,
blkdiscard
will discard all blocks on the device. Options may be used to modify
this behavior based on range or size, as explained below.
The
device
argument is the pathname of the block device.
WARNING: All data in the discarded region on the device will be lost!
OPTIONS
The
offset
and
length
arguments may be followed by the multiplicative suffixes KiB (=1024),
MiB (=1024*1024), and so on for GiB, TiB, PiB, EiB, ZiB and YiB (the "iB" is
optional, e.g., "K" has the same meaning as "KiB") or the suffixes
KB (=1000), MB (=1000*1000), and so on for GB, TB, PB, EB, ZB and YB.
- -o, --offset offset
-
Byte offset into the device from which to start discarding. The provided value
will be aligned to the device sector size. The default value is zero.
- -l, --length length
-
The number of bytes to discard (counting from the starting point). The provided value
will be aligned to the device sector size. If the specified value extends past
the end of the device,
blkdiscard
will stop at the device size boundary. The default value extends to the end
of the device.
- -p, --step length
-
The number of bytes to discard within one iteration. The default is to discard
all by one ioctl call.
- -s, --secure
-
Perform a secure discard. A secure discard is the same as a regular discard
except that all copies of the discarded blocks that were possibly created by
garbage collection must also be erased. This requires support from the device.
- -z, --zeroout
-
Zero-fill rather than discard.
- -v, --verbose
-
Display the aligned values of
offset
and
length.
If the --step option is specified, it prints the discard progress every second.
- -V, --version
-
Display version information and exit.
- -h, --help
-
Display help text and exit.
AUTHOR
Lukas Czerner
SEE ALSO
fstrim(8)
AVAILABILITY
The blkdiscard command is part of the util-linux package and is available
Linux Kernel Archive
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- OPTIONS
-
- AUTHOR
-
- SEE ALSO
-
- AVAILABILITY
-
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