High availability

Whether you need continuous availability for your business applications or are looking to reduce the amount of time it takes to perform daily backups, IBM® i high availability technologies provide the infrastructure and tools to help achieve your goals.

Most IBM i high availability solutions are built on IBM i cluster resource services, or more simply clusters. A cluster is a collection or group of multiple systems that work together as a single system. Clusters provides the underlying infrastructure that allows resilient resources, such as data, devices and applications, to be automatically or manually switched between systems. It provides failure detection and response, so that in the event of an outage, cluster resource service responds accordingly, keeping your data safe and your business operational.

The other key technology in IBM i high availability is independent disk pools. Independent disk pools are disk pools that can be brought online or taken offline without any dependencies on the rest of the storage on a system. When independent disk pools are a part of a cluster, the data that is stored within them can be switched to other systems or logical partitions. There are several different technologies, which can use independent disk pools, including switched disks, Geographic Mirror, Metro Mirror, and Global Mirror.

IBM PowerHA SystemMirror for i

IBM PowerHA® SystemMirror® for i is a licensed program that provides the following interfaces:
  • PowerHA graphical interface in the IBM Navigator for i, which allows you to work with clusters and implement high availability.
  • PowerHA commands for working with clusters, replication technologies, and administrative domains.
With the IBM PowerHA SystemMirror for i product, you can easily select, set up, and manage your high availability (HA) solution.
IBM PowerHA SystemMirror for i licensed program has been packaged into an express, standard, and enterprise editions. Below we have identified what is supported in each edition.
  • IBM PowerHA for i Express® Edition supports DS8000® Full System HyperSwap®
  • IBM PowerHA for i Standard Edition supports synchronous geographic mirroring, switched disk, LUN level switching, FlashCopy®, and all express edition function.
  • IBM PowerHA for i Enterprise Edition supports asynchronous geographic mirroring, Metro Mirror, Global Mirror, DS8000 HyperSwap with IASPs and all express and standard edition function.