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Dell PowerVault ME4 Series Storage System Administrator’s Guide

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Capacity information

The Capacity block shows two color-coded bars. The lower bar represents the physical capacity of the system, showing the capacity of disk groups, spares, and unused disk space, if any. The upper bar identifies how the capacity is allocated and used.

The upper bar shows the reserved, allocated, and unallocated space for the system. Reserved space refers to space that is unavailable for host use. It consists of RAID parity and the metadata that is needed for internal management of data structures. The terms allocated space and unallocated space have the following meanings:

For virtual storage:
  • Allocated space is the amount of space that the data written to the pools takes.
  • Unallocated space is space that is designated for a pool but has not been allocated to a volume within that pool.
  • Uncommitted space is the overall space minus the allocated and unallocated space.
For linear storage:
  • Allocated space is the space that is designated for all volumes. When a linear volume is created, space equivalent to the volume size is reserved for it. This is not the case for virtual volumes.
  • Unallocated space is the difference between the overall and allocated space.

If virtual storage is overcommitted, which means that the amount of storage capacity that is designated for use by volumes exceeds the physical capacity of the storage system, then the right upper bar is longer than the lower bar.

Hover the cursor over a segment of a bar to see the storage size of that segment. Point anywhere in this block to see the following information about capacity utilization in the Capacity Utilization panel:
  • Total Disk Capacity: The total physical capacity of the system.
  • Unsued: The total unused disk capacity of the system.
  • Total Spares: The total spare capacity of the system
  • Virtual/Linear Disk Groups: The capacity of disk groups, both total and by pool.
  • Reserved: The reserved space for disk groups, both total and by pool.
  • Allocated: The allocated space for disk groups, both total and by pool.
  • Unallocated: The unallocated space for disk groups, both total and by pool.
  • Uncommitted: The uncommitted space in each pool (total space minus the allocated and unallocated space) and total uncommitted space.

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