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

2–18 HSG60 ACS Solution Software Version 8.6 for SGI Irix Installation and Configuration Guide
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Figure 2–12. Striped mirrorset (example 1)
The failure of a single disk drive has no effect on the ability of the storageset to deliver
data to the host. Under normal circumstances, it also has very little effect on
performance. Because striped mirrorsets do not require any more disk drives than
mirrorsets, this storageset is an excellent choice for data that warrants mirroring.
Figure 2–13. Striped mirrorset (example 2)
D
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0
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Mirrorset1 Mirrorset2 Mirrorset3
A
B
C
A'
B'
C'
Virtual disk
Block 0
Block 1
Block 2
Block 3
Block 4
Block 5
etc.
Disk 1
Block 0
Block 3
Block 6
Disk2
Block 0
Block 3
Block 6
Disk 3
Block1
Block 4
Block 7
Disk 4
Block 1
Block 4
Block 7
Disk 5
Block 2
Block 5
Block 8
Disk 6
Block 2
Block 5
Block 8
Operating
system
view
Actual
device
mappings
Stripeset
CXO6462A
Virtual disk #1 Mirrorset Virtual disk #2 Mirrorset Virtual disk #3 Mirrorset
Controller
internal
mapping