HP StorageWorks HSG80 ACS Solution Software V8.8 for IBM AIX Installation and Configuration Guide (AA-RV1HA-TE, March 2005)

Planning Storage Configurations
83HSG80 ACS Solution Software V8.8 for IBM AIX Installation and Configuration Guide
Figure 26: Mirrorsets maintain two copies of the same data
Figure 27: Mirrorset example 2
Keep these points in mind when planning mirrorsets:
■ Data availability with a mirrorset is excellent but comes with a higher
cost—you need twice as many disk drives to satisfy a given capacity
requirement. If availability is your top priority, consider using dual-redundant
controllers and redundant power supplies.
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B'
B
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Mirror drives contain
copy of data
Operating
system
view
Actual
device
mappings
Mirrorset
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Disk 1
Block 0
Block 1
Block 2
etc.
Disk 2
Block 0
Block 1
Block 2
etc.
Virtual disk
Block 0
Block 1
Block 2
etc.