volumes have been allocated from those disk groups. For example, on CLARiiON storage systems these are disks that are in RAID groups.

•Unused Raw - Raw disk capacity not currently configured into any kind of RAID or disk group. Disks that have not been configured for use in provisioning volumes. For example, on the EVA or MSA, these are not part of any volume group. For enterprise arrays that are preconfigured at installation, Unused Raw will typically be zero.

•Percentage Used - The percentage of raw disk capacity used.

IMPORTANT: The raw capacity values come directly from the SMI instrumentation of storage arrays, where raw capacity is modeled as primordial storage pools.

The Raw Capacity tab provides information about the raw capacity used on a storage system. A graphic displaying what which percentage of the storage system has used raw capacity and unused raw capacity.

Viewing post-RAID information

You can view post-RAID information from the Post RAID tab.The following information is displayed on the tab.

displays the following information under the Capacity Summary and Capacity columns:

•Total Capacity - The sum of mapped, unmapped and unallocated capacities.

•Mapped - Sum of mapped volume capacities allocated from storage pools. For a volume to be 'mapped' it must be have a logical mapping to at least one host initiator.

•Unmapped - Sum of unmapped volume capacities allocated from storage pools. An unmapped volume is storage committed as a single volume but not visible or potentially visible to any initiator.

•Total Allocated - Sum of capacity in storage pools not available for creating volumes.

•Unallocated - Sum of capacity in storage pools available for creating volumes.

NOTE: Primordial pools are not available for creating volumes, so they do not contribute to this total.

•Unused Raw - Raw disk capacity not currently configured into any kind of RAID or disk group. Disks that have not been configured for use in provisioning volumes. For example, on the EVA, these are not part of any volume group. For enterprise arrays that are preconfigured at installation, Unused Raw will typically be zero.

•Percentage Allocated

364 Finding an Element’s Storage Capacity