Compaq StorageWorks HSG60 ACS Solution V8.6 for SGI IRIX Installation and Configuration Guide

2–10 HSG60 ACS Solution Software Version 8.6 for SGI Irix Installation and Configuration Guide
Storageset Planning Considerations
This section contains the guidelines for choosing the storageset type that would best
work in your subsystem:
■ “Stripeset Planning Considerations” on page 2–10
■ “Mirrorset Planning Considerations” on page 2–13
■ “RAIDset Planning Considerations” on page 2–15
■ “Striped Mirrorset Planning Considerations” on page 2–17
■ “Storageset Expansion Considerations” on page 2–19
■ “Partition Planning Considerations” on page 2–19
NOTE: Storageset expansion is synonymous with Concat Set.
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 Disk10000,
Disk20000, and Disk10100, the first chunk of an I/O request is written to Disk10000,
the second to Disk 20000, the third to Disk 10100, the fourth to Disk10000, and so
forth until all of the data has been written to the drives (Figure 2–7).