HP 166207-B21 Compaq RAID Advanced Data Guarding: A Cost-effective, Fault-tole - Page 9

Most Important, Secondary Importance, RAID Level Choice

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TC020604TB TECHNOLOGY BRIEF Compaq RAID Advanced Data Guarding ... Table 3: Important Factors in Choosing the Optimum RAID Level for Large Arrays Most Important Secondary Importance RAID Level Choice Cost Effectiveness Fault Tolerance Performance Fault Tolerance → Performance → Cost Effectiveness → Performance → Cost Effectiveness → Fault Tolerance → RAID ADG RAID 5 (RAID 0 if fault tolerance is not needed) RAID ADG RAID 1+0 RAID 5 (RAID 0 if fault tolerance is not needed) RAID 1+0 SUMMARY Compaq RAID ADG provides an advanced level of data protection for customers who need a higher level of fault tolerance than RAID 5 and a lower implementation cost than RAID 1. RAID ADG is best implemented when customers need to protect enterprise data at a lower cost than RAID 1 arrays, and when performance is not an overriding factor. RAID ADG is supported on the Compaq Smart Array 5300 Controller and can effectively protect an array of up to 56 total drives. A RAID ADG array can tolerate up to two simultaneous drive failures without downtime or data loss. RAID ADG supports Online Spare Drives and Online RAID Level Migration from RAID 1 or RAID 5. 9

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T
ECHNOLOGY
B
RIEF
Compaq RAID Advanced Data Guarding
9
TC020604TB
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Table 3: Important Factors in Choosing the Optimum RAID Level for Large Arrays
Most Important
Secondary Importance
RAID Level Choice
Fault Tolerance
→
RAID ADG
Cost Effectiveness
Performance
→
RAID 5
(RAID 0 if fault tolerance is
not needed)
Cost Effectiveness
→
RAID ADG
Fault Tolerance
Performance
→
RAID 1+0
Cost Effectiveness
→
RAID 5
(RAID 0 if fault tolerance is
not needed)
Performance
Fault Tolerance
→
RAID 1+0
S
UMMARY
Compaq RAID ADG provides an advanced level of data protection for customers who need a
higher level of fault tolerance than RAID 5 and a lower implementation cost than RAID 1. RAID
ADG is best implemented when customers need to protect enterprise data at a lower cost than
RAID 1 arrays, and when performance is not an overriding factor.
RAID ADG is supported on the Compaq Smart Array 5300 Controller and can effectively protect
an array of up to 56 total drives. A RAID ADG array can tolerate up to two simultaneous drive
failures without downtime or data loss. RAID ADG supports Online Spare Drives and Online
RAID Level Migration from RAID 1 or RAID 5.