Hp Smart Array 6i Controller and 128MB BBWC Manual de usuario Pagina 47
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Drive Arrays and Fault-Tolerance Methods 47
HP CONFIDENTIAL
File Name: 347914-1.doc Last Saved On: 1/26/04 9:31 AM
Write performance High Medium Low Low
This method is most useful when data loss is unacceptable but cost is also an
important factor. The probability that data loss will occur when an array is
configured with RAID ADG is less than it would be if it were configured with
RAID 5.
Advantages:
• Has a high read performance.
• Allows high data availability—any two drives can fail without loss of critical
data.
• More drive capacity is usable than with RAID 1+0—parity information
requires only the storage space equivalent to two physical drives.
Disadvantages:
The main disadvantage of RAID ADG is a relatively low write-performance
(lower than RAID 5), because of the need for two sets of parity data.
Comparing the Hardware-Based RAID Methods
NOTE: Not all controllers support RAID ADG.
Item RAID 0 RAID 1+0 RAID 5 RAID ADG
Alternative name Striping
(no fault
tolerance)
Mirroring Distributed
Data
Guarding
Advanced
Data
Guarding
Usable drive space* 100% 50% 67% to 93% 50% to 96%
Usable drive space formula n n/2 (n-1)/n (n-2)/n
Minimum number of physical drives 1 2 3 4
Tolerates failure of one physical
drive?
No Yes Yes Yes
Tolerates simultaneous failure of
more than one physical drive?
No Only if no two
failed drives are
in the same
mirrored pair
No Yes
Read performance High High High High
- HP Smart Array 6i Controller 1
- User Guide 1
- Part Number 347914-001 2
- Contents 3
- Array" on page 9 6
- Updating the Firmware 7
- Configuring an Array 9
- Comparing the Utilities 10
- Using ACU 11
- Using ORCA 11
- Configuration Procedure 12
- Configuring an Array 13 13
- HP CONFIDENTIAL 15
- Installing Management Agents 17
- Replacing the Battery Pack 20
- Compromised Fault Tolerance 26
- Replacing Hard Drives 27
- Moving Drives and Arrays 31
- Adding Drives 33
- Diagnosing Array Problems 35
- Drive Arrays 39
- Fault-Tolerance Methods 42
- Electrostatic Discharge 51
- Discharge 52
- Acronyms and Abbreviations 53
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