Hardware requirements for clusters

To implement a high-availability solution, you need to plan and configure a cluster. A cluster groups systems and resources in a high availability environment.

The following are the minimum hardware requirements for clusters:

You will need at least two systems or partitions running IBM® i. Cluster supports up to 128 systems within a cluster. Any System i® model that is capable of running IBM i V4R4M0, or later, is compatible for using clustering.
External uninterruptible power supply or equivalent is recommended to protect from a sudden power loss which could result in a cluster partition.
If you plan to use data resiliency technologies that require independent disk pools, you will also need to plan for hardware specific to your chosen data resiliency technology. You can also use different methods of disk protection to prevent failover from occurring should a protected disk fail.