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# FE Port - SG metrics

Unisphere collects and displays metrics for FE ports (SG).

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 FE ports (SG).

Table 1. FE Port - SG metrics
Metric | Description
--- | ---
Host IO Limit IOs/sec | The number of I/Os the FE port is processing on behalf of the specific SG
Host IO Limit Exceeded | The number of I/Os the FE port is performing on behalf of the specific SG
Host IO Limit % Time Exceeded | Host I/O limit percentage time exceeded
Host IO Limit Throughput | The number of MBs the FE port is processing on behalf of the specific SG