resize2fs - ext2/ext3/ext4 file system resizer
resize2fs [ -fFpPM ] [ -d debug-flags ] [ -S RAID-stride ] device [ size ]
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
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 shrink-
ing 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 fea-
tures 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 off-
line resize, so that the user can keep track of what the program is doing.
-P Print the minimum size of the filesystem and exit.
The resize2fs program will heuristically determine the RAID stride that was speci-
fied when the filesystem was created. This option allows the user to explicitly
specify a RAID stride setting 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 1.41.14 December 2010 RESIZE2FS(8)