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# BE Emulation metrics

The Unisphere Performance Management application enables the user to gather, view, and analyze performance data to troubleshoot and optimize the storage systems.

BE 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 back-end emulation.

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