Plan for data resilience

Data resilience is achieved when data is always available to an user or application. You can achieve data resilience through the use of logical replication or switchable independent disk pools.

• Determine which data should be made resilient
  Understand what types of data you should consider making resilient.
• Comparison of logical replication, switched disks, and cross-site mirroring
  This topic provides an overview of different data resilience technologies that can be used with clusters to enhance high availability.
• Plan for logical replication
  Multiple copies of the data are maintained with logical replication. Data is replicated, or copied, from the primary node in the cluster to the backup nodes designated in the recovery domain. When an outage occurs on the primary node, the data remains available as a designated backup node takes over as the primary point of access.
• Plan for switchable independent disk pools and cross-site mirroring (XSM)
  A single copy of the data is maintained on switchable hardware; either an expansion unit (tower) or an IOP in a logical partition environment.