HP 12000 HP VLS Solutions Guide Design Guidelines for Virtual Library Systems - Page 60

VLS9000 Storage Pooling, Single vs. Multiple Storage Pool Considerations

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Figure 22 Single vs. Multiple Storage Pool Considerations VLS9000 Storage Pooling With VLS9X00, the user establishes a storage pool policy which defines how the arrays are pooled. VLS9X00 then automatically creates storage pools based on the policy. Storage pools are defined in terms of whole arrays, which consist of one base disk array and three expansion disk arrays. The user can set the storage pool width across the arrays in the system as follows: • All (default) - One storage pool across all arrays • 1 - One storage pool across each array • 2 - One storage pool across every two arrays. • 4 - One storage pool across every four arrays • 8 - One storage pool across every eight arrays Partially populated storage pools may result if you select storage pool policy 2 or 4. For example, if the storage pool policy is two and there are three arrays in the system, the VLS divides the three arrays into two storage pools - one storage pool spans across two arrays, and the other storage pool spans across one array. See Figure 23 (page 61). If a fourth array is added, the VLS automatically adds it to the storage pool with only one array. 60 VLS Devices

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Figure 22 Single vs. Multiple Storage Pool Considerations
VLS9000 Storage Pooling
With VLS9X00, the user establishes a storage pool policy which defines how the arrays are pooled.
VLS9X00 then automatically creates storage pools based on the policy. Storage pools are defined
in terms of whole arrays, which consist of one base disk array and three expansion disk arrays.
The user can set the storage pool width across the arrays in the system as follows:
•
All (default) — One storage pool across all arrays
•
1 — One storage pool across each array
•
2 — One storage pool across every two arrays.
•
4 — One storage pool across every four arrays
•
8 — One storage pool across every eight arrays
Partially populated storage pools may result if you select storage pool policy 2 or 4. For example,
if the storage pool policy is two and there are three arrays in the system, the VLS divides the three
arrays into two storage pools – one storage pool spans across two arrays, and the other storage
pool spans across one array. See
Figure 23 (page 61)
. If a fourth array is added, the VLS
automatically adds it to the storage pool with only one array.
60
VLS Devices