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)