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# EM Director metrics

Unisphere collects and displays metrics for the EM director.

EM Director metrics are supported only by storage systems (arrays) running PowerMaxOS 10 (6079).

The following table lists all metrics that are available for the EM director.

Table 1. EM Director metrics
Metric | Description
--- | ---
% Busy | The percentage of time that the EM director is busy (numerator_delta/denominator_delta) * 100
Random Read Misses | The number of random read misses
Random Write Misses | The number of random write misses
Random Read Miss Throughput | The Random Read Miss Throughput in MBs per second
Random Write Miss Throughput | The Random Write Miss Throughput in MBs per second