Replacing a node
If a node in your cluster is faulty, its status appears as Down in the Status column of the Nodes page, and in the Cluster > Configuration page.
To replace a faulty node:
Acquire a new node that is identical to the old node, install and configure Redis Enterprise Software on it per the install instructions.
Note: If you are using Redis on Flash, you must make sure the required flash storage is set up on this new node.
Add a new node, as described in adding a new node to a cluster.
Make sure the new node has as much available memory as the faulty node.
A message appears, informing you that the cluster has a faulty node and that the new node will replace the faulty node.
If the new node has insufficient memory, you are prompted to add a different node - one with sufficient memory.
Note: If there is a faulty node in the cluster to which you are adding a node, RS will enforce using the new node to replace the faulty one.
Note: If you are using the DNS NS record based connection approach, the DNS records must be updated each time a node is added or replaced. For additional details, For more information, refer to the connection management page.