Advanced Data Guarding Option Software Reference Guide

Overview of RAID ADG
Compaq Advanced Data Guarding Option Software Reference Guide 1-5
COMPAQ CONFIDENTIAL
Writer: John Turner File Name: b-ch1 overview of RAID ADG
Codename: adg2 Part Number: 283954-001 Last Saved On: 5/22/02 12:41 PM
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 Also Important Suggested RAID Level
Fault tolerance Cost effectiveness RAID ADG
I/O performance RAID 1+0
Cost effectiveness Fault tolerance RAID ADG
I/O performance
RAID 5 (RAID 0 if fault
tolerance is not required)
I/O performance
Cost effectiveness
RAID 5 (RAID 0 if fault
tolerance is not required)
Fault tolerance RAID 1+0