Linux - NetworkingThis forum is for any issue related to networks or networking.
Routing, network cards, OSI, etc. Anything is fair game.
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I think I've isolated the root of the problem. I tried a few more searches on this site and came across a post that suggested udp might be the source of the slowdown.
So using rpcinfo I found that whereas FC1 and FC2 nfs servers provide ports (2049) for udp and tcp, the Red Hat 7.3 nfs server only provides ports for UDP. I changed the fstab entry on the RH7.3 system for rsize and wsize to be 512. That made all the difference: The file transfer that took 2,946 seconds last night took only 9 seconds this morning. I changed the size to 1024 and the delays came back (although not as severe as before).
So I isolated the problem and, more importantly, I have a fix. Although no one resoponded directly to me I did find the info I needed on this site, so thanks to all the people who inadvertently helped me!
Can someone answer this: What has changed in NFS support to cause this problem between FC2 and RH7.3? Why does it not manifest between FC1 and RH7.3?