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GROWFS(8)		FreeBSD	System Manager's Manual		     GROWFS(8)

NAME
     growfs -- expand an existing UFS file system

SYNOPSIS
     growfs [-Ny] [-s size] special | filesystem

DESCRIPTION
     The growfs	utility	makes it possible to expand an UFS file	system.
     Before running growfs the partition or slice containing the file system
     must be extended using gpart(8).  If you are using	volumes	you must
     enlarge them by using gvinum(8).  The growfs utility extends the size of
     the file system on	the specified special file.  The following options are
     available:

     -N	     ``Test mode''.  Causes the	new file system	parameters to be
	     printed out without actually enlarging the	file system.

     -y	     ``Expert mode''.  Usually growfs will ask you if you took a
	     backup of your data before	and will do some tests whether special
	     is	currently mounted or whether there are any active snapshots on
	     the file system specified.	 This will be suppressed.  So use this
	     option with great care!

     -s	size
	     Determines	the size of the	file system after enlarging in sec-
	     tors.  Size is the	number of 512 byte sectors unless suffixed
	     with a b, k, m, g,	or t which denotes byte, kilobyte, megabyte,
	     gigabyte and terabyte respectively.  This value defaults to the
	     size of the raw partition specified in special (in	other words,
	     growfs will enlarge the file system to the	size of	the entire
	     partition).

EXAMPLES
	   growfs -s 2G	/dev/ada0p1

     will enlarge /dev/ada0p1 up to 2GB	if there is enough space in
     /dev/ada0p1.

SEE ALSO
     dumpfs(8),	ffsinfo(8), fsck(8), fsdb(8), gpart(8),	newfs(8), tunefs(8)

HISTORY
     The growfs	utility	first appeared in FreeBSD 4.4.	The ability to resize
     mounted filesystems was added in FreeBSD 10.0.

AUTHORS
     Christoph Herrmann	<chm@FreeBSD.org>
     Thomas-Henning von	Kamptz <tomsoft@FreeBSD.org>
     The GROWFS	team <growfs@Tomsoft.COM>
     Edward Tomasz Napierala <trasz@FreeBSD.org>

CAVEATS
     When expanding a file system mounted read-write, any writes to that file
     system will be temporarily	suspended until	the expansion is finished.

BUGS
     Normally growfs writes cylinder group summary to disk and reads it	again
     later for doing more updates.  This read operation	will provide unex-
     pected data when using -N.	 Therefore, this part cannot really be simu-
     lated and will be skipped in test mode.

FreeBSD	10.1			April 30, 2012			  FreeBSD 10.1

NAME | SYNOPSIS | DESCRIPTION | EXAMPLES | SEE ALSO | HISTORY | AUTHORS | CAVEATS | BUGS

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