> # Tests for a Specified Module

> The system health feature in the NX-OS software performs tests in the following areas:

> - Active supervisor’s in-band connectivity to the fabric.
> - Standby supervisor’s arbiter availability.
> - Bootflash connectivity and accessibility on all modules.
> - EOBC connectivity and accessibility on all modules.
> - Data path integrity for each interface on all modules.
> - Management port’s connectivity.
> - User-driven test for external connectivity verification, port is shut down during the test (Fibre Channel ports only).
> - User-driven test for internal connectivity verification (Fibre Channel and iSCSI ports).

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