Command Section
GROWFS(8)               FreeBSD 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

     -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
             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

     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 <[email protected]>
     Thomas-Henning von Kamptz <[email protected]>
     The GROWFS team <[email protected]>
     Edward Tomasz Napierala <[email protected]>

     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.

FreeBSD 11.1-RELEASE-p4          May 10, 2016          FreeBSD 11.1-RELEASE-p4
Command Section