MapR 5.1 is at End of Life (EOL) and no longer supported. Please see the latest documentation. This documentation is not being updated.

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5.1 Administration
This section contains administration information such as managing your cluster, data, users, jobs and security information such as configuring your security environment and auditing.
Administrator Guide
Managing Data with Volumes
Using Promotable Mirrors
Volume Upgrades in Version 5.0
Enabling Features for Read-Write Support

MapR 5.1 Documentation

Enabling Features for Read-Write Support

After upgrading a cluster to Version 5.0, fully enable support for read-write mirrors (promotable mirrors) by setting both of the following parameters to 1 (true). Use the maprcli config save -values command to set these parameters.

Parameter	Default Value	Enables/Disables
mfs.feature.rwmirror.support	1 (true) for Versions 5.0, 4.1, and 4.0.2 0 (false) for earlier versions	Support for the read-write mirror feature (promotable mirrors)
mfs.feature.volume.upgrade	0 (false)	Ability to upgrade old-type volumes so they can be used as read-write mirrors

If you prefer to allow only new volumes to be promotable, you can leave mfs.feature.volume.upgrade set to 0 (false). You cannot enable mfs.feature.volume.upgrade if mfs.feature.rwmirror.support is disabled.