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This code is derived from software contributed to Berkeley by
Christoph Herrmann and Thomas-Henning von Kamptz, Munich and Frankfurt.
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$TSHeader: src/sbin/growfs/growfs.8,v 1.3 2000/12/12 19:31:00 tomsoft Exp $
$FreeBSD: stable/10/sbin/growfs/growfs.8 307403 2016-10-16 22:02:50Z sevan $
.Dd November 20, 2014 .Dt GROWFS 8 .Os .Sh NAME .Nm growfs .Nd expand an existing UFS file system .Sh SYNOPSIS .Nm .Op Fl Ny .Op Fl s Ar size .Ar special | filesystem .Sh DESCRIPTION The .Nm utility makes it possible to expand an UFS file system. Before running .Nm the partition or slice containing the file system must be extended using .Xr gpart 8 . If you are using volumes you must enlarge them by using .Xr gvinum 8 . The .Nm utility extends the size of the file system on the specified special file. The following options are available: l -tag -width indent t Fl N .Dq Test mode . Causes the new file system parameters to be printed out without actually enlarging the file system. t Fl y .Dq Expert mode . Usually .Nm will ask you if you took a backup of your data before and will do some tests whether .Ar 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! t Fl s Ar size Determines the .Ar size of the file system after enlarging in sectors. .Ar Size is the number of 512 byte sectors unless suffixed with a .Cm b , k , m , g , or .Cm t which denotes byte, kilobyte, megabyte, gigabyte and terabyte respectively. This value defaults to the size of the raw partition specified in .Ar special (in other words, .Nm will enlarge the file system to the size of the entire partition). .El .Sh EXAMPLES Expand root file system to fill up available space: .Dl growfs /
p Resize
a /dev/ada0p1 partition to 2GB and expand the file system: .Dl gpart resize -i 1 -s 2G ada0 .Dl growfs -s 2G /dev/ada0p1 .Sh SEE ALSO .Xr dumpfs 8 , .Xr ffsinfo 8 , .Xr fsck 8 , .Xr fsdb 8 , .Xr gpart 8 , .Xr newfs 8 , .Xr tunefs 8 .Sh HISTORY The .Nm utility first appeared in .Fx 4.4 . The ability to resize mounted file systems was added in .Fx 10.0 . .Sh AUTHORS .An Christoph Herrmann Aq Mt chm@FreeBSD.org .An Thomas-Henning von Kamptz Aq Mt tomsoft@FreeBSD.org .An The GROWFS team Aq Mt growfs@Tomsoft.COM .An Edward Tomasz Napierala Aq Mt trasz@FreeBSD.org .Sh CAVEATS When expanding a file system mounted read-write, any writes to that file system will be temporarily suspended until the expansion is finished. .Sh BUGS Normally .Nm writes cylinder group summary to disk and reads it again later for doing more updates. This read operation will provide unexpected data when using .Fl N . Therefore, this part cannot really be simulated and will be skipped in test mode.