cache

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However, unless the RAID controllers doing the caching are configured in dual active pairs and designed with cache coherency and robust recovery mechanisms, caching can cause incorrect data to be delivered to applications and corrupt databases when elements in the I/O path fail.
Features like cache mirroring and cache coherency have been available in RAID controllers for mainframes and high-end Unix systems for some time; however, a new generation of RAID controllers that include these features and priced for NT servers is beginning to hit the market.