Data Redundancy Using Split Mirrors
In data warehousing environments and on systems with long backup windows, it would be very convenient to work with physically separate copies of data instead of the real thing. That way, I/O-intensive processes such as backups and complex database queries don't interfere with the normal operations of the system and cause slowdowns or temporary outages.
Split mirrors help make this convenience a reality and, thus, contribute to high availability in Unix systems. A split mirror is a RAID-1 mirror in which one of the submirrors can be split off from the main device to become a completely separate device. As a submirror, this new device carries an exact copy of the original mirror's data at the time of the split. ...
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