The disk mirror, disk unmirror, and disk remirror commands control disk mirroring. All the commands can be issued while the devices are in use, so you can start or stop database device mirroring while databases are being used.
disk mirror, disk unmirror,
and disk remirror alter the sysdevices table in
the master database. After issuing any of these
commands, dump the master database to ensure
recovery in case master is damaged.
