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# Storage Group by Pool metrics

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

Table 1. Storage group (by pool) metrics
Metric | Description
--- | ---
Allocated Capacity | The total allocated SG capacity
Allocated Tracks | The number of allocated tracks in the storage group (by pool)
BE Read Reqs/sec | The number of read requests each second performed by the disk directors to cache
BE Reqs/sec | The number of read/write requests each second performed by the disk directors to cache
BE Throughput Read | The number of MBs read each second by the disk directors
BE Throughput Transferred | The MBs transferred per second to the disk directors
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
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 prefetched from disk to cache in a second

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