If you want to issue the ROLLFORWARD command to initiate location recovery, you must set the bDeleteOldLogs parameter to 0 (off).
To set the parameter (Windows):
See the section Media Failure Recovery and the SQL Reference for information about the ROLLFORWARD command.
Set bDeleteOldLogs to 1 (on) to allow developers to automatically delete location log files not needed for transient system failure recovery from the hard disk. Even with bDeleteOldLogs set to 1 (on), the server will recover to a logically consistent state after a transient system failure, such as terminating abnormally due to a power loss, or operating system failure. The logging system always preserves the last transaction.
To set the parameter (Windows):