Failover and failback options

When we start a failover or a failback operation, we have a period of time that is required for the process to actually complete. Both the actions are manually initiated and that implies that the time periods mentioned in the TechNet article, Recovery Time for Pool Failover and Pool Failback, at http://technet.microsoft.com/en-us/library/jj205079.aspx, are calculated from the moment the administrator actually launches the disaster procedure. The value indicated in the documentation as the recovery point objective (30 minutes) indicates that if we launch a failover or a failback, all the data changed in the 30 minutes between the time the failure procedure is accomplished (T) and 30 minutes before (T-30) could be lost.

As we will see, the administrator manually invokes the failover procedures using the Lync Server Management Shell. In the following schema, the various steps related to a failover and failback scenario are shown: