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# IM Emulation metrics

Unisphere collects and displays metrics for IM emulations.

IM Emulation metrics are supported only by storage systems (arrays) running HYPERMAX OS 5977 or PowerMaxOS 5978.

The following table lists all metrics that are available for IM emulations.

Table 1. IM emulations metrics
Metric | Description
--- | ---
% Busy | The percent of time the director is busy
Total Work Time | Total work time