104 Implementing the IBM Storwize V5000 Gen2 with IBM Spectrum Virtualize V8.1
If you search for external storage and you are not in the replication layer you will get the
following warning in the GUI, as shown in Figure 3-45.
Figure 3-45 Convert System to replication layer
Clicking the External Storage option opens the window as shown in Figure 3-46. It provides
the list of all externally connected (storage area network (SAN)- and iSCSI-attached) disk
systems to the Storwize V5000. The system supports also iSCSI connections to systems that
are used as external storage. Unlike Fibre Channel connections, you need to manually
configure the connections between the source system and these target external storage
systems. Direct attachment between the system and external storage systems is not
supported and requires Ethernet switches between the system and the external storage.
To avoid a single point of failure, a dual switch configuration is suggested. For full redundancy,
a minimum of two paths between each initiator node and target node must be configured with
each path on a separate switch. In addition, extra paths can be configured to increase
throughput if both initiator and target nodes support more ports. The system supports a
maximum of four paths per node.
When the new external storage system is zoned correctly to the Storwize V5000, run the
Discover storage procedure either from the Actions menu in the table header or by
right-clicking any of the existing MDisks in the list (Figure 3-46).
Figure 3-46 Detecting external storage systems
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