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

       resize2fs - ext2/ext3/ext4 file system resizer

       resize2fs  [  -fFpPMbs  ]  [  -d	 debug-flags ] [ -S RAID-stride	] [ -z
       undo_file ] 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 and the file	system
       supports	on-line	resizing.  (Modern Linux 2.6 kernels will support  on-
       line  resize  for  file	systems	mounted	using ext3 and ext4; ext3 file
       systems will require the	use of file systems with the resize_inode fea-
       ture enabled.)

       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!

       The  -b	and  -s	 options enable	and disable the	64bit feature, respec-
       tively.	The resize2fs program will, of course, take care  of  resizing
       the  block  group  descriptors  and moving other	data blocks out	of the
       way, as needed.	It is not possible to resize the filesystem concurrent
       with changing the 64bit status.

       -b     Turns  on	 the  64bit  feature, resizes the group	descriptors as
	      necessary, and moves other metadata out of the way.

       -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
		   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 en-

       -F     Flush  the  filesystem  device's buffer caches before beginning.
	      Only really useful for doing resize2fs time trials.

       -M     Shrink the file system to	minimize its size as much as possible,
	      given the	files stored in	the file system.

       -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  an	 estimate  of  the number of file system blocks	in the
	      file system if it	is shrunk using	resize2fs's -M option and then

       -s     Turns  off the 64bit feature and frees blocks that are no	longer
	      in use.

       -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.

       -z undo_file
	      Before  overwriting  a file system block,	write the old contents
	      of the block to an undo file.  This undo file can	be  used  with
	      e2undo(8)	 to restore the	old contents of	the file system	should
	      something	go wrong.  If  the  empty  string  is  passed  as  the
	      undo_file	 argument,  the	 undo  file  will be written to	a file
	      named resize2fs-device.e2undo in the directory specified via the
	      E2FSPROGS_UNDO_DIR environment variable.

	      WARNING: The undo	file cannot be used to recover from a power or
	      system crash.

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

       resize2fs was written by	Theodore Ts'o <>.

       Resize2fs  is Copyright 1998 by Theodore	Ts'o and PowerQuest, Inc.  All
       rights reserved.	 As of April, 2000 Resize2fs may be redistributed  un-
       der the terms of	the GPL.

       fdisk(8), e2fsck(8), mke2fs(8), lvm(8), lvextend(8)

E2fsprogs version 1.45.7	 January 2021			  RESIZE2FS(8)


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