Global Hot Spare - HP A3550A - High Availability Disk Arrays Model 20 Storage Enclosure User Manual

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