The FileStore DNS update feature enables users to update DNS records so that clients can be served from a different cluster. This feature is useful in failover situations where an active FileStore cluster must be brought down and the services moved to the backup cluster.
Consider the scenario shown in Figure: Active and backup clusters. In this example, there are two FileStore clusters (Cluster 1 and Cluster 2). Cluster 1 is the active cluster. Cluster 2 is the "backup" cluster, the cluster that can run services when Cluster 1 is brought down. Data is kept in synchronization between the two clusters using the FileStore replication feature. However, at any given time, the DNS server stores resource records for only one cluster.
In previous releases, DNS updates had to be done manually when cluster operations were switched form one cluster to another. Now, you can use FileStore DNS update commands to update the DNS server. The DNS update feature is supported for UNIX and Linux-based DNS servers only. Windows-based DNS servers are not supported.
By default, the DNS update service is offline. To use the DNS update service, first use the DR> dnsupdate set command to configure the DNS update service parameters, then use the DR> dnsupdate start command to start the service.