Retiring primary storage devices

You can use either the Migration page or the Storage page in the System Management Console to migrate data off of selected storage nodes in either an HCP RAIN or SAIN system or off selected storage arrays in an HCP SAIN system in preparation for retiring those devices.

Note: The migration service is not available for HCP VM systems.

During a data migration, the migration service copies objects and, if applicable, the metadata query engine index from the selected devices to free storage on the remaining devices. Before you start a data migration, you need to ensure that those devices have enough unused capacity to hold the data to be migrated.

After copying an object, the migration service deletes the object from the source device. Once the migration is complete, you can submit a request to your authorized HCP service provider to finalize the migration and remove the retired devices from the system.

Important: After the migration of data off of a storage node in an HCP RAIN system is finalized, the system can never again include a node with the same fourth octet in its back-end IP address as that node had.
Retiring a node is not part of the normal procedure for replacing a node that has failed or for upgrading to newer hardware. In these cases, the new node can use the same back-end IP address as the one being replaced.

The migration service runs only when you explicitly start a data migration. When the migration is complete, the service stops automatically.

When you start a data migration, the selected nodes or storage arrays automatically become read-only (except for allowing the migration service to delete objects). After the migration is complete, they remain read-only.

When you start a migration of data off of selected nodes in a RAIN system, HCP automatically removes any NFS volumes from those nodes and associates those volumes with other nodes in the system.

Important: To prevent data loss in namespaces that are not being replicated and that have service plans that set the ingest tier DPL to 1, always migrate data off of a device before submitting a request to your authorized HCP service provider to remove the device from the HCP system.

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