Hp Array Controller HSG V8.7 Software Bedienungsanleitung Seite 90

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312 HSG80 Users Guide
Applications that make requests for small amounts of
sequentially-located data
Applications that make synchronous random requests for small
amounts of data
By spreading the traffic evenly across the buses, you will ensure that no
bus handles the majority of data to the storageset.
Using Mirrorsets to Ensure Availability
Mirrorsets use redundancy to ensure availability, as illustrated in Figure
35. For each primary disk drive, there is at least one mirror disk drive.
Thus, if a primary disk drive fails, its mirror drive immediately provides
an exact copy of the data.
Figure 35 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 (refer to Table 31).
Data availability with a mirrorset is excellent but costlyyou 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.
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Mirror drives contain
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