Manual Reference Pages - BLKDISCARD (8)
blkdiscard - discard sectors on a device
blkdiscard is used to discard device sectors. This is useful for solid-state
drivers (SSDs) and thinly-provisioned storage. Unlike
this command is used directly on the block device.
blkdiscard will discard all blocks on the device. Options may be used to modify
this behavior based on range or size, as explained below.
device argument is the pathname of the block device.
WARNING: All data in the discarded region on the device will be lost!
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.
Print help and exit.
-o, --offset offset
Byte offset in the device from which to discard. Provided value will be
aligned to the device sector size. Default value is zero.
-l, --length length
Number of bytes after starting point to discard. 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. Default value extends to the end
of the device.
Perform secure discard. Secure discard is the same as regular discard
except all copies of the discarded blocks possibly created by garbage
collection must also be erased. It has to be supported by the device.
The blkdiscard command is part of the util-linux package and is available
Linux Kernel Archive
|util-linux ||BLKDISCARD (8) ||October 2012 |
Visit the GSP FreeBSD Man Page Interface.
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