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.
The disk mirror, disk unmirror,
and disk remirror commands alter the sysdevices table
in the master database. After issuing any of
these commands, you should dump the master database
to ensure recovery in case master is damaged.
