User`s guide

A-7
Storage Concepts
The types of arrays you can create depends on the maximum
number of disk drives you can use on the controller.
RAID 5 set ■ Lower cost than RAID 1
■ Very hig h re ad
performance (similar to
RAID 0)
■ Very high data protection
(similar to RAID 1)
■ Supports multiple
simultaneous read and
write operations
■ Can be optimized for
large, sequential requests
■ Write performance is
slower than a stripe set
(RAID 0) or mirror set
(RAID 1)
Stripe set of
mirror sets
(RAID 0/1)
■ Very high performance
■ Highest data protection;
can tolerate some cases of
multiple disk drive
failures
■ High inherent cost,
because twice the
storage capacity is
required. Requires a
minimum of four disk
drives
Stripe set of
RAID 5 sets
(RAID 50)
■ Lower cost than RAID 0/1
■ Higher performance than
RAID 5
■ Very hig h re ad
performance
■ Very high data protection
■ Optimized for multiple
simultaneous read and
write operations
■ High inherent cost,
because twice the
storage capacity is
required. Requires a
minimum of four disk
drives
Table A-1. Common Array Types
Array Type Strengths Weaknesses