Appendix D Raid Quick Reference; Comparing Raid Levels; Selecting A Raid Level By Size Of Pool - Adaptec 5325302053 User Manual

RAID Quick Reference
This appendix provides quick-reference information about the RAID levels
supported by your iSCSI Storage Appliance.

Comparing RAID Levels

Use this table to select the RAID levels that are most appropriate for the pools on
your IP SAN, based on the number of available disk drives and your requirements
for performance and reliability. Only the RAID levels supported by your iSCSI
Storage Appliance are listed.
RAID
Level
RAID 0
RAID 1
RAID 10
RAID 5
RAID 6
Spanned
Volume
Disk drive usage, read performance, and write performance depend on the number
of drives in the pool. In general, the more drives, the better the performance. More
information about each RAID level is available in the Glossary on page 213.
None of the RAID levels listed include a built-in hot spare.
Note

Selecting a RAID Level by Size of Pool

Use this table to select a RAID level based on the number of disk drives in your
pool.
Number of Disk Drives in Pool
One
Disk
Drive
Redundancy Usage
No
Yes 100%
Yes 50%
Yes 50%
Yes 67% – 94%
No 50-88%
Read
Performance Performance
✱ ✱ ✱
✱ ✱
✱ ✱
✱ ✱ ✱
✱ ✱
✱
Possible RAID Levels
Simple volume
Appendix D
Write Minimum
Disk Drives
✱ ✱ ✱
2
✱ ✱
2
✱ ✱
4
✱
3
✱
4
✱
2