Working with Mirror Volumes
A mirror volume is a read-only physical copy of another volume, the source volume. You can use mirror volumes in the same cluster (local mirroring) to provide local load balancing by using mirror volumes to serve read requests for the most frequently accessed data in the cluster. You can also mirror volumes on a separate cluster (remote mirroring) for backup and disaster readiness purposes.
For information about "promoting" mirror volumes to to read-write mode, see Using Promotable Mirrors.
Once you've created a mirror volume, keeping your mirror synchronized with its source volume is fast. Because mirror operations are based on a snapshot of the source volume, your source volume remains available for read and write operations for the entire duration of the process.
Auditing at the volume level is not
enabled on remote mirror volumes even if it is enabled on their source volumes. You
must run the volume audit
command to
enable auditing at the volume level for a remote mirror volume. Auditing at the object
level for particular directories, files, and MapR-DB tables in a remote mirror volume is
enabled automatically if auditing is enabled for them in the source volume. For full
details about auditing, see Auditing of Cluster Administration and Operations on Directories, Files,
Tables, and Streams.
The following sections provide information about how to work with mirror volumes: