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EMC Fibre Channel Storage System Model FC4700 Configuration Planning Guide
RAID Types and Tradeoffs
Use a RAID0 Group (nonredundant individual access array) for
applications where
•High availability is not important.
•You can affor d to lose access to all d ata stor ed on a L UN if a s ingle
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.