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

growfs — expand an existing UFS file system

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

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:
“Test mode”. Causes the new file system parameters to be printed out without actually enlarging the file system.
“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!
size
Determines the size of the file system after enlarging in sectors. 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).

Expand root file system to fill up available space:

growfs /

Refresh the LUN size, resize the partition to use all available capacity, and expand the filesystem accordingly:

camcontrol reprobe da0
gpart recover da0
gpart resize -i 1 da0
growfs /dev/da0p1

camcontrol(8), fsck(8), gpart(8), newfs(8), tunefs(8)

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

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

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

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

May 10, 2016 FreeBSD-11.1