C:\>nsrndmp_recover -c server -s backupserver -S 3829507662 -v off "/filesystem/filename.pdf" NDMP Service Debug: The process id for NDMP service is 0xdbc4010 42787:nsrndmp_recover: Performing recover from NDMP type of device NDMP Service Debug: The process id for NDMP service is 0xdbc4010 42897:nsrndmp_recover: Opened the tape device : c304t0l0 42690:nsrndmp_recover: Performing non-DAR Recovery.. 42744:nsrndmp_recover: Tape server paused: reached the end of file 42897:nsrndmp_recover: Opened the tape device : c416t0l0 42870:nsrndmp_recover: Continuing recover from the next volume NDMP Service Debug: Invalid header. Starting valid header search. NDMP Service Debug: Too much retry on header research
42619:nsrndmp_recover: NDMP Service Warning: These files were not restored (Rest ore failed with error, or file/directory specified but not found in backup):
42617:nsrndmp_recover: NDMP Service Log: /filesystem/filename.pdf
42617:nsrndmp_recover: NDMP Service Log: server_archive: emctar vol 1, 839105 fi les, 367231610880 bytes read, 0 bytes written
It looks to me like this backup spans several volumes, when it reaches the end of the first volume it appears that it is unable to read the second volume. You would need to investigate further what may be the cause of this.