Raid 5 - Adaptec DuraStor 7220SS User Manual

Drive 1
Partition A1
4 GB
Chunks
1,P*,7,10,13...
*P = Parity
Figure A-6 RAID 5 set
Applications Suitable for RAID 5 Sets
These types of applications are suitable for RAID 5 sets:
Transaction read requests are high.
I
Data availability is worth protecting, but the cost of mirroring
I
would excessive.
Writes are a small percentage of the I/O load, such as inquiry
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type transaction processing, group office automation, and online
customer service departments.
Drive 2
Partition A3
Partition A2
4 GB 4 GB
Chunks
Chunks
3,5,8,P*,15...
2,4,P*,11,14...
RAID 5 Set A
12 GB
Chunks 1,2,3,4,5,6,7,8,
9,10,11,12,13,14,15...
Drive 3
Drive 4
Free Space
Partition A4
4 GB
Chunks
P*,6,9,12,P*...
Storage Concepts
A-12