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 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 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 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!

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 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 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 setting
              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@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                          February 2014                                     RESIZE2FS(8)