Can anyone shed some light on this? I am getting CRC errors only on some of my linux clients. netapp support is trying to find the bug id or trouble call id. It has followed the connection from an F330 to an F760; both on quad ethernet cards(different model cards). It has survived from 5.3.4 to 6.1R1. The clients see hangs on large file reads and "TCP 111" errors even though we mount UDP NFS V3. Clients even report "server not responding".

I'd appreciate any help, if someone has researched this problem area. I know it looks like a linux problem, but I have had little success finding reference to the recent nfs v3 problem.

Steve Losen scl@sasha.acc.virginia.edu@mathworks.com on 10/18/2001 10:25:54 AM

I am running RedHat 7.1 and NFS mounting a netapp F820 running 6.0.1R3. Things work pretty smoothly, but I have experienced the same problem as another poster (sorry, lost the message) where NFS writes occasionally delay and a "NFS server not responding" error is logged. I have not tried the rsize=1023,wsize=1023 work around.

I have experienced the same problem with NFS servers other than Netapp, including a IBM RS6000 running AIX.

Non Linux NFS clients are having no delay problems with the Netapp filers, so I'm pretty sure it is on the Linux end.

For awhile I thought the NIC on my Linux box had botched the speed/duplex negotiation with the ethernet switch. Our network folks can tell me what speed the switch port has negotiated, but I don't know how to check my NIC from Linux. The network folks tell me they see no errors on my switch port when I experience NFS delays. I don't seem to have any other network problems, so I doubt this is the problem.

I have been able to duplicate the problem on a second Linux box. However, on a third box, essentially identical to mine and also running RH 7.1, I could not duplicate it.

A couple of things to be aware of with RedHat Linux and NFS.

Prior to RedHat 7.0, only NFS v2 was supported. Furthermore, Linux only supported 16 bit uids and gids. We have a lot of files on our Netapp filers with uids greater than 65535.

RedHat 7.1 supports NFS v3 and 32 bit uids and gids. 32 bit uids are critical in our environment. I administer our filers and when I was running RH 6.2, I could not get accurate file owner information with "ls" and I could not "chown" files to uids over 65535, so I had to use another unix box for filer administration. Now I can do it all from my Linux box.

Steve Losen scl@virginia.edu phone: 434-924-0640

University of Virginia ITC Unix Support