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# FE by SG Metrics

Unisphere collects and displays metrics for FE by SG.

EM Director metrics are supported only by storage systems (arrays) running PowerMaxOS 10 (6079). V4 is used to denote that the metric is supported only by a storage system (array) running PowerMaxOS 10 (6079).

The following table lists all metrics that are available for FE by SG.

Table 1. EM Emulation metrics
Metric | Description
--- | ---
Host IO Limit % Time Exceeded | Host I/O limit percentage time exceeded
Host IO Limit IOs/sec | The number of I/Os being processed
Host IO Limit Throughput | The number of MBs being processed
Time Host IO Limit Exceeded | The time that the host I/Os limit is exceeded