An administrator is troubleshooting an outage in which a core switch in one of the redundant fabrics has failed. The servers connected to one of the storage arrays lost access to their assigned…

Even if array controllers were not configured for failover, losing one fabric should not cause total loss of LUNs if the other fabric's connections are still active and available to the active controller.

Having only one controller does not inherently mean a total loss of LUNs if that single controller is connected to both redundant fabrics and one fabric fails.

If all controllers of a specific storage array are connected only to the fabric that experienced a switch failure, then that array would lose all connectivity when that fabric fails. This configuration creates a single point of failure, explaining why only that array's LUNs became inaccessible despite the presence of redundant fabrics overall.

Incompatible HBA firmware might cause performance issues or intermittent connectivity, but it is unlikely to cause a complete and sudden loss of LUN access specifically tied to a fabric switch failure for only one array.