Hitachi VSP G200 System Administration Manual page 24

one or more storage systems and may need to add disks to increase storage
capacity. Review the information gauge for each storage system to identify
which storage system needs additional capacity. In addition, check disks for
each storage system to determine if there is unused capacity available for
parity group creation.
The right side of the resource summary offers alternate views:
• Protection: is the breakdown of data protection metrics including a
• Tier Breakdown: is a visualization of the amount of each tier that is
• Savings: tab displays the following ratios:
Analyzing data in the dashboard
The dashboard is a visual display of the important information needed to
analyze the overall capacity utilization and health of your storage system. It
provides visual indicators such as total usable capacity, current utilization,
data protection summary, and monitoring alerts.
Analyzing data shown in alert tiles
The alert tiles collectively present the health of the storage system
environment. In one glance you can verify that the overall health is sound if
you see no alerts on the alert tiles. This means that there are no capacity or
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System Administrator Guide for VSP Gx00 models and VSP Fx00 models
representation of types of protected, unprotected, and secondary capacity
and gauge of the total percentage of capacity protected.
allocated to pools.
○ Data Reduction: : The ratio of logical used capacity to the physical
used capacity, for all compression and deduplication technologies. It is
calculated as follows:
– For disk-based compression = Capacity 1 / Capacity 2.
– For controller-based compression = Capacity 3 / Capacity 4.
– Data reduction savings = Capacity 1 + Capacity 3 / Capacity 2 +
Capacity 4.
– Capacity 1 = logical used capacity of a parity group.
– Capacity 2 = physical used capacity of a parity group.
– Capacity 3 = logical used capacity of a pool.
– Capacity 4 = physical used capacity of a pool.
○ Capacity Efficiency: : The ratio of Thin Free plus Thin Used to the
physical used capacity. Capacity efficiency is only calculated for volumes
on HDP and HDT pools.
– If disk-based compression is in use, either alone or in combination
with controller-based compression, the physical used capacity is that
resulting from disk-based compression alone.
– If only controller-based compression is in use, the physical used
capacity is that resulting from controller-based compression.
– If no compression is in use then physical used capacity is the used
capacity of the pool(s).
System administration overview