Skip site navigation (1)Skip section navigation (2)

FreeBSD Manual Pages


home | help
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 file system is mounted, it can be used  to  expand  the
       size  of	the mounted file system, assuming the kernel and the file sys-
       tem 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 file system.
       If no units are specified, the units of the size	parameter shall	be the
       file system blocksize of	the file system.  Optionally, the size parame-
       ter 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 file system 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 file system, 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  file  sys-
       tem.   After  running  fdisk(8),	 run resize2fs to resize the ext2 file
       system 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 file system.  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	file system!

       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 file  system  concur-
       rent 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	file system size (-M) calculation

       -f     Forces  resize2fs	 to proceed with the file system resize	opera-
	      tion, overriding some safety checks which	resize2fs normally en-

       -F     Flush  the  file system 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     Print  out  percentage  completion bars for each resize2fs phase
	      during an	offline	(non-trivial) resize operation,	 so  that  the
	      user  can	 keep  track  of what the program is doing.  (For very
	      fast resize operations, no progress bars may be displayed.)

       -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  file	 system	 was  created.
	      This  option allows the user to explicitly specify a RAID	stride
	      setting 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 file system as estimated by resize2fs	may be
       incorrect, especially for file systems 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 1.46.4	  August 2021			  RESIZE2FS(8)


Want to link to this manual page? Use this URL:

home | help