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Linux 2.6 - man page for resize2fs (linux section 8)

RESIZE2FS(8)									     RESIZE2FS(8)

       resize2fs - ext2/ext3/ext4 file system resizer

       resize2fs [ -fFpPM ] [ -d debug-flags ] [ -S RAID-stride ] 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  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

       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  shrink-
       ing  the  size of the partition, make sure you do not make it smaller than the new size of
       the ext2 filesystem!

       -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 fea-
	      tures from the following list:
		   2	- Debug block relocations
		   4	- Debug inode relocations
		   8	- Debug moving the inode table

       -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 off-
	      line 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 speci-
	      fied when the filesystem was created.  This option allows the  user  to  explicitly
	      specify a RAID stride setting to be used by resize2fs instead.

       The  minimum size of the filesystem as estimated by resize2fs may be incorrect, especially
       for filesystems with 1k and 2k blocksizes.

       resize2fs was written by Theodore Ts'o <tytso@mit.edu>.

       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)

E2fsprogs version 1.41.14		  December 2010 			     RESIZE2FS(8)

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