Symmetrix DMX RAID 5
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Data Integrity, Availability, and Protection
RAID 5 configuration
guidelines
The following are some guidelines to consider when configuring
RAID 5 devices:
◆ BCVs can be RAID 5 devices.
◆ SymmOptimizer Swap supports RAID 5 devices.
◆ SRDF devices can be RAID 5 devices.
◆ eSNAP source and destination devices can be RAID 5 devices.
◆ A log device can be a RAID 5 device.
◆ Concurrent Copy is supported with RAID 5.
RAID 5 configuration
rules
The following configuration rules apply to RAID 5:
◆ Only one member of a RAID 5 group is permitted per drive loop.
This configuration requires a minimum of eight drive enclosures
for RAID 5 (7+1) and four drive enclosures for RAID 5 (3+1).
◆ RAID 5 (3+1) and (7+1) can co-exist in the same system.
◆ An n + 1 RAID 5 group requires one spare.
◆ Customers can configure more than one spare on RAID 5 systems
(not in the same RAID 5 group), which can protect them from
multiple drive failures.
◆ A single RAID 5 protection scheme can be configured within a
system with any combination of SRDF, BCV, and mirroring
protection.
◆ When a spare is invoked against a RAID 5 member, the same
track can be valid on either the member or the spare, not both at
the same time.
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