Global Hot Spare - HP A3550A - High Availability Disk Arrays Model 20 Storage Enclosure User Manual
High availability disk array
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Also See for A3550A - High Availability Disk Arrays Model 20 Storage Enclosure:
- User manual (367 pages) ,
- Installation manual (4 pages) ,
- Installation manual (2 pages)
Table of Contents
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Global Hot Spare
RAID Performance
Table 1-5 Relative Performance, Cost, and Availability Compared to an Individual Disk
Physical disk
configuration
RAID-5 group with 5
disk modules
RAID-3 group with 5
disk modules
RAID-1/0 group with 10
modules
RAID-1/0 group with 6
modules
RAID-1 mirrored pair
1-42
Planning Disk Unit Configurations
Relative read
Relative write
performance
performance
without caching
without caching
Up to 5.0
Up to 1.25
Up to 4.0
Up to 4.0
Up to 10.0
Up to 5.0
Up to 6.0
Up to 3.0
Up to 2.0
1.0
Relative cost
Tolerance for
per MB of
single disk
storage
module failure?
1.25
Yes
1.25
Yes
2.0
Yes
2.0
Yes
2.0
Yes
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Table of Contents
Troubleshooting
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