Hitachi VSP F400, System Administration Manual, Page: 85 / 414

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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.
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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 then physical used capacity is the used capacity of
the pool(s).
• View a graph of utilization and thresholds.
• If the pool is based on a parity group using accelerated compression ("FMD
DC2 Compression"), you can also view compression details, including
expansion ratio and compression ratio.
• View tier information for the pool.
You can view:
• Tier management status
This is set to Automatic when the pool is created in Storage Advisor. To
change this mode to Manual you must edit the pool using the SVP.
• Monitoring mode
Displays the monitoring mode set for the HDT Pool. This is set to
Continuous when the pool is created in Storage Advisor. To change the
mode to Periodic, you must edit the pool using the SVP.
• Tier usage information
Displays the HDT Pool tier usage for the pools supported on the storage
system. Storage Advisor supports Bronze, Silver, Gold, and Platinum
tiers.
For each tier, you can display statistics for used capacity, performance
utilization, and buffer space.
• View volumes carved from the pool and perform operations on them.
Operations available include deletion, updating, attaching and detaching to
and from servers, protecting, unprotecting, and restoring. Click a volume
in tile or list view to open the detail page for the volume.
The Provisioning Status can be any of the following:
Configuring the storage system 85
System Administrator Guide for VSP Gx00 models and VSP Fx00 models