What possibilities are there for load balancing?

For active/passive, there are many possibilities, like Storage Mirroring, V-Motion etc.
An active/active configuration for multiple clients can be achieved by a cross-wise connection of active/passive components. It is sometimes beneficial to have clients with their own machines.

When using the API, the ISV can implement an active/active access. Currently, this is only possible using hp iCAS Content Server solution or Optimal Systems.