Forced recovery is used when the protected site is no longer operational enough to allow SRM to perform its tasks at the protected site before the failover. It is enabled at the recovery site, thereby letting the recovery site to failover machines from the protected site by skipping the protected site operations.
For instance, if there is an unexpected power outage at the protected site, not only the ESXi hosts but also the storage array become unavailable. In this scenario, SRM cannot perform any of its tasks at the protected site, such as shutting down the protected VMs or replicating the most recent storage changes (if the replication is asynchronous).