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A
B
C
Figure 3–5. Mirrorsets Maintain Two Copies of the Same Data
Considerations for Planning a Mirrorset
Keep these points in mind as you plan your mirrorsets:
A controller can support up to 30 storagesets, consisting of mirrorsets and
RAIDsets. Mirrorsets that are members of a stripeset count against this limitation
(see Table 3–1).
Data availability with a mirrorset is excellent but costly—you need twice as
many disk drives to satisfy a given capacity requirement. If availability is your
top priority, consider using redundant power supplies and dual-redundant
controllers.
You can configure up to 30 mirrorsets per controller or pair of dual-redundant
controllers. Each mirrorset contains a minimum of one member and a maximum
of six members.
A write-back cache module is required for mirrorsets, but write-back cache need
not be enabled for the mirrorset to function properly.
Both write-back cache modules must be the same size.
Compaq HSZ80 Array Controller ACS Version 8.3 Configuration and CLI Reference Guide
A'
Mirror drives contain
copy of data
B'
C'
3–13
CXO5511A
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