About warm and cold standby disaster recovery

There are two types of cluster geographical redundancy disaster recovery support in Blue Planet, warm and cold standby. You can create redundancies in software, hardware, and data to increase high availability for any services by configuring either of the following:

  • Warm standby geographical support: Where a secondary node in a cluster acts as backup of an identical primary system after primary node failure. Data gets mirrored to a secondary system using scheduled disk-based replication or a shared disk. This process uses cluster manager automation via the Blue Planet georedundancy app, but users must complete a restore manually. This generally provides a recovery time of a few minutes and requires you to set up a mirrored version of your system. For details, see Managing warm standby disaster recovery.

  • Cold standby geographical support: Where a secondary node in a cluster acts as backup of an identical primary system after manual intervention. You must manually back up the primary system onto a storage system and complete a restore to a secondary system if and when required. This generally provides a recovery time of a few hours and requires you to have a space to store your backup files versus mirroring an entire system. This support is limited to Blue Planet Orchestration. For details, see Managing cold standby disaster recovery.

Warm standby georedundant-aware applications

Some Blue Planet applications are aware of the disaster recovery requirement to save stored data in case of a critical failure. Each application is responsible for replicating their state from the active to the standby site. Replication is asynchronous and attempts to be real-time, but may lag depending on the write rate and WAN performance.

The following applications support replication in warm geored:

  • Cassandra

  • Datomic

  • bpocore (git data)

  • Galera

  • Chronos

  • login-ui

The northbound interface of an application may not be present until the standby site becomes the active site.

results matching ""

    No results matching ""