Stripe Set Of Raid 5 Sets (Raid 50 - Adaptec DuraStor 7220SS User Manual

The stripe set of mirror sets is the top-level array, and mirror sets
A, B, and C are the underlying arrays.
Applications Suitable for RAID 0/1 Sets
The following types of applications benefit from the increased data
availability and performance provided by RAID 0/1 sets:
Any data whose value and volume justifies placing it on
I
mirrored disk storage.
Applications with I/O loads consisting predominantly of
I
concurrent read requests, such as transaction processing and
database serving applications.
Other types of multilevel arrays exist, though the stripe set of
mirror sets offers the best balance of performance and redundancy
of all the multilevel array types.

Stripe Set of RAID 5 Sets (RAID 50)

Multilevel arrays or hybrid arrays are arrays that contain other
arrays. A stripe set of RAID 5 sets, also known in Disk Array
Administrator as RAID 50, is a multilevel array made up of two or
more equal-sized RAID 5 sets. The data in a stripe set of RAID 5
sets is redundant. The parity RAID layer (RAID 5) of this array
enhances data availability by protecting against loss due to
member disk drive failure. The striping layer improves I/O
performance (compared to that of parity alone). The parity RAID
arrays' member disk drives provide high data transfer
performance.
Figure A-8 represents a stripe set of RAID 5 sets created from two
equal-sized RAID 5 sets (A and B) and striped across six disk
drives. Each RAID 5 set is made up of three equal-sized partitions
on three separate disk drives. The free space of the larger drive is
not used.
Storage Concepts
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