resize2fs - ext2/ext3 file system resizer
resize2fs [ -d debug-flags ] [ -S RAID-stride ] [ -f ] [ -F ] [ -p ]
device [ size ]
The resize2fs program will resize ext2 or ext3 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 only.).
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.
The resize2fs program does not manipulate the size of partitions. If
you wish to enlarge a filesystem, you must first 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 youre 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!
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
1 - Print out all disk I/O
2 - Debug block relocations
8 - Debug inode relocations
16 - Debug moving the inode table
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.
-p Prints out a percentage completion bars for each resize2fs oper
ation, so that the user can keep track of what the program is
-f Forces resize2fs to proceed with the filesystem resize opera
tion, overriding some safety checks which resize2fs normally
-F Flush the filesystem devices buffer caches before beginning.
Only really useful for doing resize2fs time trials.
resize2fs was written by Theodore Tso .
Resize2fs is Copyright 1998 by Theodore Tso 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 1.40-WIP November 2006 RESIZE2FS(8)