08-22-2007
yeah still using one good old pII-333 ... with linux (of course)
Will move to a better (and secure) one soon
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LEARN ABOUT CENTOS
blkdiscard
BLKDISCARD(8) System Administration BLKDISCARD(8)
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.
-h, --help
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.
-s, --secure
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.
-v, --verbose
Print aligned offset and length arguments.
AUTHOR
Lukas Czerner <lczerner@redhat.com>
SEE ALSO
fstrim(8)
AVAILABILITY
The blkdiscard command is part of the util-linux package and is available Linux Kernel Archive <ftp://ftp.kernel.org/pub/linux/utils/util-
linux/>.
util-linux October 2012 BLKDISCARD(8)