resize2fs [ -fFpPM ] [ -d debug-flags ] [ -S RAID-stride ] device [
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 giga-
bytes, 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 oper-
ation 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!
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
2 - Debug block relocations
4 - Debug inode relocations
8 - Debug moving the inode table
-P Print the minimum size of the filesystem and exit.
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 set-
ting to be used by resize2fs instead.
The minimum size of the filesystem as estimated by resize2fs may be
incorrect, especially for filesystems with 1k and 2k blocksizes.
resize2fs was written by Theodore Ts'o <email@example.com>.
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.
fdisk(8), e2fsck(8), mke2fs(8), lvm(8), lvextend(8)
E2fsprogs version 1.42 November 2011 RESIZE2FS(8)
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