HP StorageWorks HSG80 ACS Solution Software V8.8 for Novell NetWare Installation and Configuration Guide (AA-RV1MA-TE, March 2005)

Planning Storage Configurations
78 HSG80 ACS Solution Software V8.8 for Novell NetWare Installation and Configuration Guide
Planning Considerations for Storageset
This section contains the guidelines for choosing the storageset type needed for
your subsystem:
■ "Stripeset Planning Considerations", page 78
■ "Mirrorset Planning Considerations", page 80
■ "RAIDset Planning Considerations", page 82
■ "Striped Mirrorset Planning Considerations", page 84
■ "Storageset Expansion Considerations", page 86
■ "Partition Planning Considerations", page 86
Stripeset Planning Considerations
Stripesets (RAID 0) enhance I/O performance by spreading the data across
multiple disk drives. Each I/O request is broken into small segments called
“chunks.” These chunks are then simultaneously “striped” across the disk drives
in the storageset, thereby enabling several disk drives to participate in one I/O
request.
For example, in a three-member stripeset that contains disk drives Disk 10000,
Disk 20000, and Disk 10100, the first chunk of an I/O request is written to Disk
10000, the second to Disk 20000, the third to Disk 10100, the fourth to Disk
10000, until all of the data has been written to the drives (Figure 24).
Figure 24: Three-member RAID 0 stripeset (example 1)
D
i
s
k
1
0
0
0
0
CXO7287A
Chunk 1
4
D
i
s
k
2
0
0
0
0
2
5
D
i
s
k
1
0
1
0
0
36
1
2
4
5
6
3