System topology

The system topology can be set up in following ways.

  • Standard topology, where all nodes in the system are at the same site.
    Figure 1. Example of a standard system topology
    This figure shows an example of a standard system topology
  • Stretched topology, where each node of an I/O group is at a different site. When one site is not available, access to a volume can continue but with reduced performance. This topology is only available on SAN Volume Controller.
    Figure 2. Example of a stretched system topology
    This figure shows an example of a stretched system topology

Summary of system topology and volumes

Table 1 summarizes the types of volumes that can be associated with each system topology.
Table 1. System topology and volume summary
Topology Volume Type
Basic Stretched Custom
Standard X   X
Stretched X X X