In fabric-attached MetroCluster, a site failure is defined as the complete failure of the primary controller and disk shelves.

• A. ISL failure
• B. Interconnect cable failure
• C. Complete failure of the primary controller and disk shelves
• D. Fibre Channel adapter malfunction

Answer: (C)

In fabric-attached MetroCluster, a site failure means the entire site is down because both the primary controller and the disk shelves at that site are unavailable. This level of loss triggers site-level failover and allows the remaining site to continue serving I/O. The other scenarios describe connectivity or component issues that don’t wipe out all resources at a site—for example, an ISL failure breaks the inter-site link, an interconnect cable failure disrupts fabric connectivity, and a Fibre Channel adapter malfunction affects a host port rather than the whole site. Therefore, the only description that defines a site failure is the complete loss of the primary controller and disk shelves.