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RESIZE2FS(8)                System Manager's Manual               RESIZE2FS(8)

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 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 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  respec-
       tively. 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 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!
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  opera-
              tion,  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 oper-
              ation 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 set-
              ting 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 AT 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)

E2fsprogs version 1.42.9         December 2013                    RESIZE2FS(8)