If the system crashes while you are using the RFUTIL Roll Forward utility, use the RETRY qualifier to resume the roll forward:

Use of this qualifier is limited to RFUTIL roll-forward operations that fail because of power outages or system failures. The ROLL FORWARD RETRY qualifier restarts the roll-forward operation on the after-image extent that was in the process of rolling forward. The retry operation finds the transaction in process at the time of failure and resumes rolling forward.