08-19-2015
Quote:
Originally Posted by
Don Cragun
I assume you meant bs=4 instead of bs=3, but when processing a 1.2Gb file, dd will run noticeably faster with its default block size (512 bytes) or a larger size like bs=1024000. The dd bs=n parameter specifies how many bytes dd will read at a time from its input file and how many bytes at a time it will write to its output file.
With conv=unblock, it is just the conversion buffer size (specified by cbs=n) that determines the output line length produced by the dd utility.
Although I presume the system cache and the filesystem block size will soften the blow in the sense that usually this should translate into io sizes that are equivalent to the filesystem block size or multiples thereof, depending on how smart the filesystem is...
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LEARN ABOUT REDHAT
resize_reiserfs
RESIZE_REISERFS(8) System Manager's Manual RESIZE_REISERFS(8)
NAME
resize_reiserfs - Reiserfs filesystem resizer
SYNOPSIS
resize_reiserfs [ -s [+|-]size[K|M|G] ] [ -j dev ] [ -fqv ] device
DESCRIPTION
The resize_reiserfs tool resizes an unmounted reiserfs file system. It enlarges or shrinks an reiserfs file system located on a device so
that it will have size bytes or size=old_size +(-) size bytes if the + or - prefix is used. If the -s option is not specified, the
filesystem will be resized to fill the given device. The size parameter may have one of the optional modifiers K, M, G, which means the
size parameter is given in kilo-, mega-, gigabytes respectively.
The resize_reiserfs program does not manipulate the size of the device. If you wish to enlarge a filesystem, you must make sure you expand
the underlying device first. This can be done using cfdisk(8) for partitions, by deleting the partition and recreating it with a larger
size (assuming there is free space after the partition in question). Make sure you re-create it with the same starting disk cylinder as
before! Otherwise, the resize operation will certainly not work, and you may lose your entire filesystem.
The resize_reiserfs program allows to grow a reiserfs on-line if there is a free space on block device.
If you wish to shrink an reiserfs partition, first use resize_reiserfs to shrink the file system. You may then use cfdisk(8) to shrink the
device. When shrinking the size of the device, make sure you do not make it smaller than the reduced size of the reiserfs filesystem.
OPTIONS
-s [+|-]size
Set the new size in bytes.
-j dev Set the journal device name.
-f Force, do not perform checks.
-q Do not print anything but error messages.
-v Turn on extra progress status messages (default).
RETURN VALUES
0 Resizing successful.
-1 In another case.
EXAMPLES
The following example shows how to test resize_reiserfs. Suppose 2Gb reiserfs filesystem is created on the device /dev/hda8 and is mounted
on /mnt. For shrinking the device we need to unmount it first, then run resize_reiserfs with a size parameter (in this case -1Gb):
df
umount /mnt
resize_reiserfs -s -1G /dev/hda8
mount /dev/hda8 /mnt
df /mnt
WARNING
Note that this is a BETA program and may corrupt filesystems.
AUTHOR
This version of resize_reiserfs has been written by Alexander Zarochentcev <zam@namesys.com>.
BUGS
Please, report about the bugs to Alexander Zarochentcev <zam@namesys.com> or to Hans Reiser <reiser@namesys.com>.
SEE ALSO
cfdisk(8), reiserfsck(8), debugreiserfs(8)
Reiserfsprogs-3.6.4 January 2002 RESIZE_REISERFS(8)