Finding a configuration to use for recovering a cluster

You use the configuration from either a node in the cluster or a cluster configuration backup file to recover a cluster.

1. Choose a type of configuration to recover the cluster.
   • A node in the cluster

     If the cluster consists of more than one node, and one of the nodes has a cluster configuration from when the cluster was in the desired configuration, then you can recover the cluster using the configuration stored on that node.

     In most cases, the node containing the replication ring with the most recent transaction ID is the best node to use for restoring the cluster configuration. The cluster ring show command at the advanced privilege level enables you to view a list of the replicated rings available on each node in the cluster.

   • A cluster configuration backup file

     If you cannot identify a node with the correct cluster configuration, or if the cluster consists of a single node, then you can use a cluster configuration backup file to recover the cluster.

     Recovering a cluster from a configuration backup file might require the use of diagnostic tools to resolve discrepancies between the backup and the cluster configuration present on the recovering node. Therefore, if you use a configuration backup file, you should plan to contact technical support.

2. If you chose to use a cluster configuration backup file, then make the file available to the node you plan to use to recover the cluster.

   If the configuration backup file is located...	Then...
   At a remote URL	Use the system configuration backup download command at the advanced privilege level to download it to the recovering node.
   On a node in the cluster	Use the system configuration backup show command at the advanced privilege level to find a cluster configuration backup file that was created when the cluster was in the desired configuration. If the cluster configuration backup file is not located on the node you plan to use to recover the cluster, then use the system configuration backup copy command to copy it to the recovering node.