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# Pool by Storage Group metrics

Unisphere collects and displays metrics for pools by storage group.

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 pools by storage group.

Table 1. Pool by storage group metrics
Metric | Description
--- | ---
Allocated Capacity | The allocated capacity for the pool by storage group in GBs
Allocated Tracks | The number of allocated tracks in the pool
BE Read Reqs/sec | A data transfer of a read between the cache and the director
BE Reqs/sec | The number of data transfers between cache and the pool by storage group
BE Throughput Read | The number of MBs read by the disk directors from the disk each second.
BE Throughput Transferred | Calculated value: (MBs read per sec + MBs written per sec)
Destage Write Throughput | The size (MBs) of writes per second that were destaged to disk.
Destage Writes/sec | The number of writes per second that were destaged to disk.
IO Density | The number of BE requests per GB of disk. (BE Reads + destaged writes)/capacity
Local Replication Tracks | Local replication tracks
Prefetched Throughput | The number of MBs prefetched from disk to cache in a second.
Prefetched Tracks/sec | The number of tracks per second prefetched from disk to cache upon detection of a sequential read stream.