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In this competitive business climate, well-planned business continuity strategies must include redundancy to ensure server resources are able to access storage devices even in the event of a failure. Disks and controllers can fail, and data paths can become congested resulting in bottlenecks or can fail entirely cutting off access to key information. Storage RAID technologies are great solutions for providing high availability for storage devices (disks), however, they do not address the physical path between the server and storage. If there is only a single path from the server to storage and one component fails, no amount of disk redundancy can keep the data available.
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