While doing some transfers to an F760 (5.1.2P2) the perfomance seems to ramp from good to lousy. I can find nothing wrong with the network - this is data coming from a system on the same subnet (100tx-fd). Data transfers between other systems on the same segment do not show these types of performance problems - here's a typical output from a sysstat 1: ( i am reading from one place on the filer and writing to another)

CPU NFS CIFS HTTP Net kB/s Disk kB/s Tape kB/s Cache in out read write read write age 12% 232 1 0 949 947 640 0 0 0 12 34% 644 0 0 2425 2445 2336 0 0 0 12 12% 233 2 0 1020 1015 1049 0 0 0 12 4% 0 1 0 1 0 0 0 0 0 12 4% 2 0 0 0 0 0 0 0 0 12 19% 488 4 0 1970 1984 1724 0 0 0 12 49% 448 0 0 1700 1656 2226 7075 0 0 12 15% 139 0 0 128 158 148 3976 0 0 12 4% 0 1 0 0 0 0 0 0 0 12 19% 139 8 0 601 613 708 0 0 0 12 25% 621 0 0 2702 2719 2342 0 0 0 12 19% 467 0 0 2049 2027 1888 0 0 0 12 4% 16 1 0 20 3 0 0 0 0 12 4% 91 1 0 15 16 0 0 0 0 12

Anybody have any insights into what might be causing this?

Thanks, Graham