EMC CX500I Configuration Guide - Page 49

In any RAID 5, RAID 3, RAID 1/0 or RAID 1 Group, high

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Page 49 highlights

RAID Types and Trade-offs 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. Guidelines for RAID Groups 2-19

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Guidelines for RAID Groups
2-19
RAID Types and Trade-offs
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.