Hitachi VSP G200 System Administration Manual page 23

If you do not have any parity groups configured on the storage system,
this number is zero and all other data points in the capacity visualization
are zero.
Note: To understand uninitialized raw capacities, review the
available unused disks on the detail page for each storage system.
• The light grey ring indicates the sum of all pool capacity available across
all storage systems. The dark grey indicates the parity group capacity that
is not yet allocated to pools.
If you do not have any pools created, the light grey ring indicates zero. As
you create pools, this number increases to eventually become equal to the
total usable capacity when you have consumed all parity groups for pool
creation.
Note: Allocated to Pools plus Unallocated to Pools equals the Total
Usable Capacity in the center of information gauge.
• The light green ring (Thin Used) indicates the storage utilization. As you
create volumes on the pools and start consuming capacity, the utilization
of thin pools increases and you will notice the value in green starting to
increase.
If Thin Used starts to increase and get closer to your total pool capacity,
that indicates that the pools may be starting to fill up.
Note: The Thin Free and Thin Used capacities include both Thin and
Snap. Thin Used plus Thin Free equals Allocated to Pools.
• Physical capacity allocated to file pools is indicated by medium blue in the
File view and by light blue in the Unified view.
• File pool utilization is indicated by light blue in the File view and by
medium blue in the Unified view.
• File over-commit capacity is represented by darkest gray in the outer ring
of the File view.
• The subscribed capacity of all volumes, as a percentage, is represented by
white in the outermost ring in the Block and Unified views. If the white
ring extends outside the circle, it indicates oversubscription. Capacity
subscription beyond the total available capacity should not be an issue if
your capacity utilization is well within the total capacity.
• Physical capacity, or total usable capacity across all parity groups, is
represented by dark blue in the outermost ring in the Block and Unified
views.
If you notice the total pool capacity (light grey) and Thin used (light green)
values getting closer to total capacity, you may be running out of storage on
System administration overview
System Administrator Guide for VSP Gx00 models and VSP Fx00 models
23