I was just wondering if the iSeries OS supported NFSv4.

I KNOW LINUX DOES. Especially with a Kernel after 2.6.19, but even better with 2.6.20.

This works very nicely:
/nfs/data               192.168.1.*(rw,fsid=0,no_root_squash,sync,no_subtree_check)\n/nfs/data/stor          192.168.1.*(rw,wdelay,nohide,insecure,root_squash,no_subtree_check)\n/nfs/data/music         192.168.1.*(rw,wdelay,nohide,insecure,root_squash,no_subtree_check)


And damn its as fast as line speed will allow, except that GigE on Linux really does require TOE NICs, or TCP Offload NICs.