отбросить сектора на устройстве (discard sectors on a device)
Имя (Name)
blkdiscard - discard sectors on a device
Синопсис (Synopsis)
blkdiscard [options] [-o offset] [-l length] device
Описание (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!
Параметры (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.
-f, --force
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.
-o, --offset offset
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.
-l, --length length
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.
-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.
