NAME
blkdiscard - discard sectors on a deviceSYNOPSIS
blkdiscard [options] [-o offset] [-l length] deviceDESCRIPTION
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.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.Disable all checking. Since v2.36 the block
device is open in exclusive mode ( O_EXCL) by default to avoid
collision with mounted filesystem or another kernel subsystem. The
--force option disables the exclusive access mode.
Byte offset into the device from which to
start discarding. The provided value must be aligned to the device sector
size. The default value is zero.
The number of bytes to discard (counting from
the starting point). The provided value must 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.
The number of bytes to discard within one
iteration. The default is to discard all by one ioctl call.
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.
Zero-fill rather than discard.
Display the aligned values of offset
and length. If the --step option is specified, it prints the
discard progress every second.
Display help text and exit.
Print version and exit.
AUTHORS
Lukas <[email protected]>CzernerSEE ALSO
fstrim(8)REPORTING BUGS
For bug reports, use the issue tracker at <https://github.com/util-linux/util-linux/issues>.AVAILABILITY
The blkdiscard command is part of the util-linux package which can be downloaded from Linux Kernel Archive <https://www.kernel.org/pub/linux/utils/util-linux/>.2022-05-11 | util-linux 2.38.1 |