Migrating a Volume off a Node

When you need to migrate a data volume off a particular node, move that node from the /data path to the /decommissioned path. Since no data volumes are assigned to that topology path, standard data replication will migrate the data off that node to other nodes that are still in the /data topology path.

You can run the following command to check if a given volume is present on a specified node:

maprcli dump volumenodes -volumename <volume> -json | grep <ip:port>

Run this command for each non-local volume in your cluster. Once all the data has migrated off the node, you can decommission the node or place it in maintenance mode.

If you need to segregate CLDB data, create a /cldb topology node and move the CLDB nodes under /cldb. Point the topology for the CLDB volume (mapr.cldb.internal) to /cldb. See Isolating CLDB Nodes for details.

NOTE: To move an existing volume to another topology, you must have the Converged Enterprise Edition installed on your system. Without the Converged Enterprise Edition, when you run the

maprcli volume
                              move

command to move a volume to another topology, the following error message is returned:

ERROR (10010) - Volume Move: No license for requested operation