Capacity Sizing; Node Oversubscription; Vls9000 And Vls12000 Node Oversubscription; Vls9000 And Vls12000 Node Oversubscription Options - HP StorageWorks 12000 - Virtual Library System EVA Gateway Manual

Capacity Sizing

Several factors affect how much disk space is required for the desired retention scheme:
• Data compression rate.
• Daily change rate.
• Retention policy, or the number of full and incremental backups retained.
• "Scratch" space required for post-processing.
Download the HP StorageWorks Sizer tool to help determine your capacity needs. The tool is available
on the HP website: http://www.hp.com/go/storageworks/sizer.

Node Oversubscription

With Accelerated deduplication on the VLS9000 and VLS12000, you can add more nodes to enhance
the deduplication performance of the systems. For every standard node (with virtual library devices
configured on its front-end Fibre Channel ports), you can add one extra node dedicated to
deduplication processing (with no virtual devices configured on its front-end Fibre Channel ports).
You can add up to the maximum of eight total nodes (currently the maximum number of nodes for a
deduplication-enabled device is four). For example, if you have a 2-node VLS9000 system licensed
for deduplication, you can add up to two additional nodes to increase deduplication performance.
See Figure 69. This configuration must have a minimum of two VLS9000 arrays configured to meet
the performance sizing rules for the two standard nodes; you do not need to configure additional
arrays when adding the extra two nodes for deduplication. See
Figure 69 VLS9000 and VLS12000 node oversubscription
.
Table 25 VLS9000 and VLS12000 Node Oversubscription Options
Number of arrays
1
158 Virtual Library Systems
Number of nodes
1 2
X Y
Table 25.
3 4