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NAME | SYNOPSIS | DESCRIPTION | OPTIONS | KNOWN BUGS | AUTHOR | COPYRIGHT | SEE ALSO | COLOPHON |
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RESIZE2FS(8) System Manager's Manual RESIZE2FS(8)
resize2fs - ext2/ext3/ext4 file system resizer
resize2fs [ -fFpPMbs ] [ -d debug-flags ] [ -S RAID-stride ] [ -z
undo_file ] 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 file system is mounted, it can
be used to expand the size of the mounted file system, 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 file
system. If no units are specified, the units of the size
parameter shall be the file system blocksize of the file system.
Optionally, the size parameter may be suffixed by one of the
following units designators: 'K', 'M', 'G', 'T' (either upper-case
or lower-case) or 's' for power-of-two kilobytes, megabytes,
gigabytes, terabytes or 512 byte sectors respectively. The size of
the file system 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.
The resize2fs program does not manipulate the size of partitions.
If you wish to enlarge a file system, 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 file system. After running fdisk(8),
run resize2fs to resize the ext2 file system 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 file system. 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 file system!
The -b and -s options enable and disable the 64bit feature,
respectively. The resize2fs program will, of course, take care of
resizing the block group descriptors and moving other data blocks
out of the way, as needed. It is not possible to resize the file
system concurrent with changing the 64bit status.
-b Turns on the 64bit feature, resizes the group descriptors
as necessary, and moves other metadata out of the way.
-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 file system size (-M) calculation
-f Forces resize2fs to proceed with the file system resize
operation, overriding some safety checks which resize2fs
normally enforces.
-F Flush the file system device's buffer caches before
beginning. Only really useful for doing resize2fs time
trials.
-M Shrink the file system to minimize its size as much as
possible, given the files stored in the file system.
-p Print out percentage completion bars for each resize2fs
phase during an offline (non-trivial) resize operation, so
that the user can keep track of what the program is doing.
(For very fast resize operations, no progress bars may be
displayed.)
-P Print an estimate of the number of file system blocks in
the file system if it is shrunk using resize2fs's -M option
and then exit.
-s Turns off the 64bit feature and frees blocks that are no
longer in use.
-S RAID-stride
The resize2fs program will heuristically determine the RAID
stride that was specified when the file system was created.
This option allows the user to explicitly specify a RAID
stride setting to be used by resize2fs instead.
-z undo_file
Before overwriting a file system block, write the old
contents of the block to an undo file. This undo file can
be used with e2undo(8) to restore the old contents of the
file system should something go wrong. If the empty string
is passed as the undo_file argument, the undo file will be
written to a file named resize2fs-device.e2undo in the
directory specified via the E2FSPROGS_UNDO_DIR environment
variable.
WARNING: The undo file cannot be used to recover from a
power or system crash.
The minimum size of the file system as estimated by resize2fs may
be incorrect, especially for file systems with 1k and 2k
blocksizes.
resize2fs was written by Theodore Ts'o <[email protected]>.
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)
This page is part of the e2fsprogs (utilities for ext2/3/4
filesystems) project. Information about the project can be found
at ⟨http://e2fsprogs.sourceforge.net/⟩. It is not known how to
report bugs for this man page; if you know, please send a mail to
[email protected]. This page was obtained from the project's
upstream Git repository
⟨git://git.kernel.org/pub/scm/fs/ext2/e2fsprogs.git⟩ on
2025-08-11. (At that time, the date of the most recent commit
that was found in the repository was 2025-07-31.) If you discover
any rendering problems in this HTML version of the page, or you
believe there is a better or more up-to-date source for the page,
or you have corrections or improvements to the information in this
COLOPHON (which is not part of the original manual page), send a
mail to [email protected]
E2fsprogs version 1.47.3 July 2025 RESIZE2FS(8)
Pages that refer to this page: ext4(5), fsadm(8)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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