Using Promotable Mirrors for Disaster Recovery

The concept of promoting a mirror refers to the ability to make a read-only mirror volume into a read-write volume. The main use case for this feature is to support disaster-recovery scenarios in which a read-only mirror needs to be promoted to a read-write volume so that it can become the primary volume for data storage.

A MapR administrator can perform the following tasks from a remote datacenter before, during, and after a disaster:
  • Set up mirroring to a remote cluster
  • Fail over to a mirror volume
  • Restore the mirror relationship

For a brief overview of the terminology used to describe volume types, along with some basic commands, see the Glossary.

The following sections provide information about how to use promotable mirrors for disaster recovery: