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# Core metrics

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

Core 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 the core.

Table 1. Core metrics
Metric | Description
--- | ---
% Busy | The percentage of time that the port is busy
SYMMK Idle Time | SYMMK idle time