NAME¶
blkdiscard - discard sectors on a device
SYNOPSIS¶
blkdiscard [
-o offset] [
-l length]
[
-s] [
-v]
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.
- -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.
- -v, --verbose
- Display the aligned values of offset and length.
- -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