Chapter 8. MetroCluster 121
8.7.1 MetroCluster host failure
In this scenario, N series N1 (Node 1) failed. CFO/MetroCluster takes over the services and
access to its disks, as shown in Figure 8-14. The fabric switches provide the connectivity for
the N series N2 and the hosts to continue to access data without interruption.
Figure 8-14 IBM System Storage N series failure
8.7.2 N series and expansion unit failure
Figure 8-15 shows the loss of one site, which results from failure of the controller and shelves
at the same time.
Figure 8-15 Controller and expansion unit failure
To continue access, a failover must be performed by the administrator by running the cfo -d
command. Data access is restored because DC1 mirror was in sync with DC1 primary.
Through connectivity that is provided by the fabric switches, all hosts again have access to
the required data.
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