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EMC Fibre Channel Storage System Model FC4700 Configuration Planning Guide
RAID Types and Tradeoffs
Use a RAID 0 Group (nonredundant individual access array) for
applications where
• High availability is not important.
• You can afford to lose access to all data stored on a LUN if a single
disk fails.
• Overall performance is very important.
Use an individual unit for applications where
• High availability is not important.
• Speed of write access is somewhat important.
Use a hot spare where
• In any RAID 5, RAID 3, RAID 1/0 or RAID 1 Group, high
availability is so important that you want to regain data
redundancy quickly without human intervention if any disk in
the group fails.
• Minimizing the degraded performance caused by disk failure in a
RAID 5 or RAID 3 Group is important.