Extending a FreeBSD ZFS volume after extending the disk in VMware

This assumes a single disk attached to a zvol. In this case the disk /dev/da1

  1. Ensure that the autoexpand attribute is set to on on the ZFS volume, otherwise set it to on
zpool get autoexpand
zpool set autoexpand=on
  1. Shutdown the server
shutdown -h now
  1. Extend the disk in VMware (not shown here)
  2. Start the server
  3. Login and look at the current space.
zpool get size
NAME PROPERTY VALUE SOURCE
 size 350G
  1. Expand it
$ zpool online -e /dev/da1
  1. View the new size
zpool get size
NAME PROPERTY VALUE SOURCE
 size 398G -