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# IM Director metrics

Unisphere collects and displays metrics for IM directors.

IM Director 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 directors.

Table 1. IM director metrics
Metric | Description
--- | ---
% Busy | The percent of time the director is busy
Memory Page Fall thru Time | Memory page fall through time
Memory Page Usage | Memory page usage