diff options
Diffstat (limited to 'sys-utils/blkdiscard.8')
| -rw-r--r-- | sys-utils/blkdiscard.8 | 51 |
1 files changed, 29 insertions, 22 deletions
diff --git a/sys-utils/blkdiscard.8 b/sys-utils/blkdiscard.8 index e71a09360..3c0334f1b 100644 --- a/sys-utils/blkdiscard.8 +++ b/sys-utils/blkdiscard.8 @@ -1,5 +1,5 @@ .\" -*- nroff -*- -.TH BLKDISCARD 8 "October 2012" "util-linux" "System Administration" +.TH BLKDISCARD 8 "July 2014" "util-linux" "System Administration" .SH NAME blkdiscard \- discard sectors on a device .SH SYNOPSIS @@ -15,7 +15,7 @@ blkdiscard \- discard sectors on a device .B blkdiscard is used to discard device sectors. This is useful for solid-state drivers (SSDs) and thinly-provisioned storage. Unlike -.BR fstrim (8) +.BR fstrim (8) , this command is used directly on the block device. .PP By default, @@ -33,32 +33,39 @@ The .I offset and .I 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 +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. -.IP "\fB\-h, \-\-help\fP" -Display help text and exit. -.IP "\fB\-o, \-\-offset\fP \fIoffset\fP" -Byte offset in the device from which to discard. Provided value will be -aligned to the device sector size. Default value is zero. -.IP "\fB\-l, \-\-length\fP \fIlength\fP" -Number of bytes after starting point to discard. Provided value will be -aligned to the device sector size. If the specified value extends past +KB (=1000), MB (=1000*1000), and so on for GB, TB, PB, EB, ZB and YB. +.TP +.BR \-o , " \-\-offset \fIoffset" +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. +.TP +.BR \-l , " \-\-length \fIlength" +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, .B blkdiscard -will stop at the device size boundary. Default value extends to the end +will stop at the device size boundary. The default value extends to the end of the device. -.IP "\fB\-s, \-\-secure\fP" -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. -.IP "\fB\-v, \-\-verbose\fP" -Print aligned +.TP +.BR \-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. +.TP +.BR \-v , " \-\-verbose" +Display the aligned values of .I offset and -.I length -arguments. +.IR length . +.TP +.BR \-V , " \-\-version" +Display version information and exit. +.TP +.BR \-h , " \-\-help" +Display help text and exit. .SH AUTHOR .MT lczerner@redhat.com Lukas Czerner |