Disaster Recovery Concepts

Disaster Recovery is a situation where a set of running systems must be replaced by another set of running systems due to failure, damage, loss of connectivity, or other traumatic event. Disaster Recovery is a large scale event and is not intended to replace fault tolerance where the failure of individual components can be recovered or otherwise accommodated without stopping a running system.

In a disaster recovery scenario, running systems are not expected to seamlessly or automatically failover to backup or alternative systems. Recovering from a disaster scenario implies a substantial and potentially large scale system stoppage and a restart of an entirely new instance of the previously running system. It is not intended for short term outages such as normal maintenance operations.
Note: The replacement systems activated during disaster recovery are designed to remain in operation for days, weeks, or even months depending on the severity of the disaster.

ActiveSpaces supports disaster recovery by creating a gridset.

  • Gridsets
    The purpose of gridsets is to help set up the disaster recovery process. A group of data grids that share the same set of consistent data is referred to as a gridset. Each gridset has a name, which exists in the same namespace as grid names (For example, you cannot have a grid named “prod” and a gridset named “prod”). Each gridset also has a single primary grid. Within a gridset, there is a single authoritative schema, which is owned by the primary grid of the gridset.
  • Types of Grids
  • Mirroring
    The process by which data is copied from one grid to another is called mirroring.