Planning for high availability

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 by using the other site without loss of performance. For information about planning for a HyperSwap topology system, see Planning for a HyperSwap topology system.