Metrocluster Interconnect Failure - IBM N Series Hardware Manual

Through connectivity provided by the fabric switches, all hosts again have access to the
required data.

8.7.3 MetroCluster interconnect failure

In this scenario, the fabric switch interconnects have failed (Figure 8-16). Although this is not
a critical failure, resolve it promptly before a more critical failure occurs.
Figure 8-16 Interconnect failure
During this period, data access is uninterrupted to all hosts. No automated controller takeover
occurs. Both controller heads continue to serve its LUNs/volumes. However, mirroring and
failover are disabled, thus reducing data protection. When the interconnect failure is resolved,
resyncing of mirrors occurs.
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IBM System Storage N series Hardware Guide