Sustained 100 MBytes/s per stream seen over here with NDMP and this path:  IQ108NL -> Backup accel -> GigE -> Symantec MB 7.1 -> IBM LTO 5, block size 256 KB  (Similar or better over FC, but can't use currently)  -- Peter
Are there any whitepapers on NDMP configuration and performance for Isilon?
NDMP Backup Performance