Note that it is also required to prevent /etc/init.d/umountfs and /etc/init.d/umountnfs.sh from unmounting /rofs and /cow, otherwise the client will freeze when trying to shutdown or restart.
Note that it is also required to prevent /etc/init. d/umountfs and /etc/init. d/umountnfs. sh from unmounting /rofs and /cow, otherwise the client will freeze when trying to shutdown or restart.