NAME¶
resize2fs - ext2/ext3/ext4 file system resizer
SYNOPSIS¶
resize2fs [
-fFpPM ] [
-d debug-flags ] [
-S
RAID-stride ]
device [
size ]
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 and the file system supports
on-line resizing. (Modern Linux 2.6 kernels will support on-line resize for
file systems mounted using ext3 and ext4; ext3 file systems will require the
use of file systems with the resize_inode feature enabled.)
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
16 - Print timing information
32 - Debug minimum filesystem size (-M) calculation
- -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.
KNOWN BUGS¶
The minimum size of the filesystem as estimated by resize2fs may be incorrect,
especially for filesystems with 1k and 2k blocksizes.
AUTHOR¶
resize2fs was written by Theodore Ts'o <tytso@mit.edu>.
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.
SEE ALSO¶
fdisk(8),
e2fsck(8),
mke2fs(8),
lvm(8),
lvextend(8)