DNS Redirection

Important! This is the recommended redirection method for Oracle HA scenarios. During scenario creation, this setting is On by default.

DNS Redirection changes the Master server DNS to the Replica server IP address. Upon failure of the Master, the Replica server modifies the appropriate DNS record so that references to the Master server resolve to the Replica's IP address rather than the Master's IP address. This redirection method requires no network reconfiguration and works in LAN and WAN network configurations.

DNS redirection works only with A (host) type records and cannot update CNAME (Alias) records directly. However, if the CNAME record points to the modified A record, it is indirectly redirected.

Using the record that has the Master server's name is the default, however you can configure Arcserve HA to redirect any DNS A (host) record via the Master's name in DNS setting in the switchover properties tab.

Note: If you use Switch Hostname as the redirection method in UNIX/Linux scenarios, you should also set DNS redirection for those scenarios.