HSG80 ACS Solution Software V8.6 for Windows NT and Windows 2000 Installation and Configuration Guide

2–14 HSG80 ACS Solution Software Version 8.6 for Windows NT and Windows 2000 Installation and

Configuration Guide

Storageset Planning Considerations

This section contains the guidelines for choosing the storageset type needed for your

subsystem:

■ “Stripeset Planning Considerations,” page 2–14

■ “Mirrorset Planning Considerations,” page 2–16

■ “RAIDset Planning Considerations,” page 2–18

■ “Striped Mirrorset Planning Considerations,” page 2–20

■ “Storageset Planning Considerations,” page 2–14

■ “Partition Planning Considerations,” page 2–22

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, and so forth until

all of the data has been written to the drives (Figure 2–10).

Figure 2–10. A 3-member RAID 0 stripeset (example 1)

CXO7287A

Chunk 1