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# Port Group metrics

Unisphere collects and displays metrics for port groups.

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 port groups.

Table 1. Port group metrics
Metric | Description
--- | ---
% Busy | The percent of time that the port group is busy
Avg IO Size | Calculated value: (HA Kbytes transferred per sec/total I/O operations per second)
Host IOs/sec | The number of host I/O operations performed each second, including writes and random and sequential reads
Host Throughput | The number of host MBs read each second
Read Throughput | The number of reads per second in MBs
Reads/sec | The average number of host reads performed per second
Throughput Written | The number of writes per second in MBs
Writes/sec | The average number of host writes performed per second

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