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SQL Server® 2008 Administration: Real World Skills for MCITP Certification and Beyond by Tom Carpenter

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RAID-Based Data Redundancy

Data availability technologies are used to keep data online and available with little or no down time. Data redundancy is essential to recoverability. If your data exists only in one place, it cannot be recovered should that storage location fail. Availability is provided through internal server techniques as well as through the use of multiple servers. Internal server techniques include component-level redundancy solutions such as RAID and software solutions. Multiple-server techniques include mirroring, log shipping, replication, and clustering.

RAID (redundant array of independent disks) is one such internal server or external storage technology that may be hardware or software based. Hardware-based RAID uses hardware ...

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