resize2fs
ext2/ext3/ext4 file system resizer
see also :
fdisk - e2fsck - mke2fs
Synopsis
resize2fs
[ -fFpPM ] [ -d debug-flags
] [ -S RAID-stride ] device [
size ]
add an example, a script, a trick and tips
examples
source
sleep 10
resize2fs /dev/vg00/var
sleep 10
resize2fs /dev/vg00/home
source
lvscan
resize2fs /dev/mapper/VG0-SysVol
else
cfdisk /dev/sda
echo "The server will
reboot in 5 seconds to effect changes"
source
log_daemon_msg "Starting resize2fs_once"
&&
resize2fs /dev/mmcblk0p2 &&
rm /etc/init.d/resize2fs_once &&
update-rc.d resize2fs_once remove &&
source
echo "resize2fs
test" > $OUT
# Look at existing inline extended
attribute
echo "debugfs -R ''stat
file'' $TMPFILE 2>&1 | grep ''^Inode\|in inode body\|name
= ''" >> $OUT
echo "resize2fs
$TMPFILE 5M" >> $OUT
$RESIZE2FS $TMPFILE 5M 2>&1 >> $OUT.new 2>&1
status=$?
echo Exit status is $status >> $OUT.new
description
The
resize2fs program will resize ext2, ext3, or ext4
file systems. It can be used to enlarge or shrink an
unmounted file system located on device. If the
filesystem is mounted, it can be used to expand the size of
the mounted filesystem, assuming the kernel supports on-line
resizing. (As of this writing, the Linux 2.6 kernel supports
on-line resize for filesystems mounted using ext3 and
ext4.).
The size
parameter specifies the requested new size of the
filesystem. If no units are specified, the units of the
size parameter shall be the filesystem blocksize of
the filesystem. Optionally, the size parameter may be
suffixed by one of the following the units designators:
’s’, ’K’, ’M’, or
’G’, for 512 byte sectors, kilobytes, megabytes,
or gigabytes, respectively. The size of the
filesystem may never be larger than the size of the
partition. If size parameter is not specified, it
will default to the size of the partition.
Note: when
kilobytes is used above, I mean real, power-of-2
kilobytes, (i.e., 1024 bytes), which some politically
correct folks insist should be the stupid-sounding
’’kibibytes’’. The same holds true
for megabytes, also sometimes known as
’’mebibytes’’, or gigabytes, as the
amazingly silly ’’gibibytes’’. Makes
you want to gibber, doesn’t it?
The
resize2fs program does not manipulate the size of
partitions. If you wish to enlarge a filesystem, you must
make sure you can expand the size of the underlying
partition first. This can be done using fdisk(8) by
deleting the partition and recreating it with a larger size
or using lvextend(8), if you’re using the
logical volume manager lvm(8). When recreating the
partition, make sure you 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. After running fdisk(8), run resize2fs to
resize the ext2 filesystem to use all of the space in the
newly enlarged partition.
If you wish to
shrink an ext2 partition, first use resize2fs to
shrink the size of filesystem. Then you may use
fdisk(8) to shrink the size of the partition. When
shrinking the size of the partition, make sure you do not
make it smaller than the new size of the ext2
filesystem!
options
-d
debug-flags
Turns on various resize2fs
debugging features, if they have been compiled into the
binary. debug-flags should be computed by adding the
numbers of the desired features from the following list:
2
- Debug block relocations
4
- Debug inode relocations
8
- Debug moving the inode table
-f
Forces resize2fs to proceed with the filesystem resize
operation, overriding some safety checks which resize2fs
normally enforces.
-F
Flush the filesystem device’s buffer caches before
beginning. Only really useful for doing resize2fs
time trials.
-M
Shrink the filesystem to the minimum size.
-p
Prints out a percentage completion bars for each
resize2fs operation during an offline resize, so that
the user can keep track of what the program is doing.
-P
Print the minimum size of the filesystem and exit.
-S
RAID-stride
The resize2fs program
will heuristically determine the RAID stride that was
specified when the filesystem was created. This option
allows the user to explicitly specify a RAID stride setting
to be used by resize2fs instead.
copyright
Resize2fs is Copyright 1998 by Theodore Ts’o and PowerQuest, Inc.
All rights reserved. As of April, 2000 Resize2fs may be
redistributed under the terms of the GPL.
known bugs
The minimum size of the filesystem as estimated by resize2fs may
be incorrect, especially for filesystems with 1k and 2k
blocksizes.
see also
fdisk ,
e2fsck , mke2fs , lvm,
lvextend
author
resize2fs
was written by Theodore Ts’o
<tytso[:at:]mit[:dot:]edu>.