IBM V7000 Introduction And Implementation Manual page 424

Limitations on the SAN Volume Controller and Storwize V7000
partnership
From Version 6.4.1, IBM Flex System V7000 Storage Node, SAN Volume Controller, and IBM
Storwize V7000 systems can be partners in a Remote Copy partnership. There are, however,
a few limitations:
The layer for both IBM Flex System V7000 Storage Node and the IBM Storwize V7000
must be set to replication for remote copy to work with the SVC in the mix. The default is
storage
If any other IBM Flex System V7000 Storage Node, SAN Volume Controller or IBM
Storwize V7000 ports are visible on the SAN, aside from the ones on the cluster where
you are making changes, you cannot change the layer.
If any host object is defined to an IBM Flex System V7000 Storage Node, SAN Volume
Controller or IBM Storwize V7000 system attached, you cannot change the layer.
If any MDisks from an IBM Flex System V7000 Storage Node or IBM Storwize V7000
other than the one you are making the layer change on are visible, you cannot change the
layer.
If any cluster partnership is defined, you cannot change the layer.
Partnership topologies
A partnership is allowed between up to four IBM Flex System V7000 Storage Nodes.
Here are some typical partnership topologies between multiple IBM Flex System V7000
Storage Nodes:
Daisy-chain topology (Figure 9-56):
Figure 9-56 Daisy-chain topology for IBM Flex System V7000 Storage Node
Triangle topology (Figure 9-57):
Figure 9-57 Triangle topology for IBM Flex System V7000 Storage Node
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