Chapter 5. Monitoring the Disks
Disk technologies provide some level of protection against failure. To reduce or eliminate system downtime due to disk failures, technologies such as Redundant Array of Inexpensive Disks (RAID) or mirroring must be used to provide data redundancy. RAID technology uses parity data to ensure that recovery is possible in the event of a disk failure. Mirroring allows multiple copies of data to be maintained. Three-way mirroring, in particular, provides added data protection during backups, because mirroring continues on the disks that are not being backed up.
With data redundancy, data is protected if an initial failure occurs, but the initial failure may result in a loss of redundancy, or a single point of failure ...
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