You must plan which system topology to use and if you intend
to link with partner systems at other sites.
Choose one of the following system topologies:
The standard topology where all
control enclosures are at the same site. Higher availability can
be achieved by using Metro Mirror or Global Mirror to maintain a copy
of a volume on a different system at a remote site.
For information about planning for Metro Mirror and
Global Mirror, see Configuring IP partnerships in the Related
concepts section.
The HyperSwap® topology
where each I/O group and its managed disks are at a different site.
Active-active remote copy relationships mean that a volume can be
active on two I/O groups so that it can immediately be accessed via
the other site without loss of performance. For information about
planning for a HyperSwap topology system, see Planning for a HyperSwap
topology system.