If you want to retain the historical information about attribute values and alarms on a primary Admin Node that has failed, you need to restore the Admin Node database. This database can only be restored if your StorageGRID Webscale system includes more than one Admin Node.
If an Admin Node fails, the historical information about attribute values and alarms that are stored in its Admin Node database are lost. When you recover an Admin Node, the software installation process creates a new database for the NMS service. After the recovered Admin Node is started, it records attribute and audit information for all services as if you had performed a new installation of the StorageGRID Webscale system.
If you restored a primary Admin Node and your StorageGRID Webscale system has another Admin Node, you can restore this historical information by copying the Admin Node database from a non-primary Admin Node (the source node) to the recovered primary Admin Node. If your system has only a primary Admin Node, you cannot restore the Admin Node database.