Choosing A Raid Method - Compaq 166207-B21 - Smart Array 5302/32 RAID Controller Reference Manual

Choosing a RAID Method

There are three primary reasons for using RAID ADG:
•
You need greater fault tolerance than RAID 5 can provide but you also want to
use as much drive space as possible for data.
•
You need to use a greater percentage of drive space for data than with RAID 1+0
while maintaining a high level of fault tolerance.
•
You need a large logical volume, incorporating over ten hard drives.
Table 1-2 may help you to decide which RAID option is best for your situation.
Table 1-2: Choosing a RAID Method
Most Important
Fault tolerance
Cost effectiveness
I/O performance
Compaq Advanced Data Guarding Option Software Reference Guide
Also Important
Cost effectiveness
I/O performance
Fault tolerance
I/O performance
Cost effectiveness
Fault tolerance
Suggested RAID Level
RAID ADG
RAID 1+0
RAID ADG
RAID 5 (RAID 0 if fault
tolerance is not required)
RAID 5 (RAID 0 if fault
tolerance is not required)
RAID 1+0
Overview of RAID ADG
1-5