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# Storage resource by pool metrics

Unisphere collects and displays metrics for storage resource (by pool).

Within the PM metrics section, V4 is used to denote that the metric is supported only by a storage system (array) running PowerMaxOS 10 (6079). V3 is used to denote that the metric is supported only by a storage system (array) running HYPERMAX OS 5977 or PowerMaxOS 5978. Metrics without the denotation are supported by all storage systems (arrays).

The following table lists all metrics that are available for storage resource group (by pool).

Table 1. Storage resource by pool metrics
Metric | Description
--- | ---
Allocated Capacity | The allocated capacity
Allocated Tracks | The allocated tracks
BE Read Reqs/sec | BE read requests per second
BE Reqs/sec | BE requests per second
BE Throughput Read | BE throughput read
BE Throughput Transferred | BE throughput transferred
Destage Write Throughput | Destage Write throughput
Destage Writes/sec | Destage Writes per second
IO Density | I/O Density
Local Replication Tracks | Local Replication Tracks
Prefetched Throughput | Prefetched throughput
Prefetched Tracks/sec | Prefetched tracks per second

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