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EMC Fibre Channel Storage-System Configuration Planning
RAID Types and Tradeoffs
Use a RAID 0 Group (nonredundant individual access array) for
applications where
• High availability is not important
• 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