The link down/up is a problem but I dont see it causeing stale file handles. The nfs server wont restart because the link dropped. If the client tries a nfs trasnaction while the link is down then you might a NFS server timeout then later a server ok, reported on the client when the nfs server responds. But not a stale file handle. Dont get me wrong the link down is bad and will affect all network traffic to/from the server. I just do not see it causeing stale file handles.
Yeah, I've tried reading up on the stale NFS file handle error, and I can't see how any of the scenarios apply to my case. For example, if you've got multiple NFS clients, one client deletes a file, and the other one tries to access that file and it still thinks it's there due to caching.
I've set acdirmin=0,acdirmax=0 in my fstab to disable caching, but that didn't have any effect on the problem. I only have one NFS client (The MythTV machine), so I don't see how that'd really make much of a difference.
I'm using a different switch now, and that didn't affect it either.
So now that I've got a new NIC in there, I think the last thing would be the cable. But I'm hoping this takes care of it! :)
I'm using SMB for now just because because this stale NFS file handle thing has left a bad taste in my mouth. I'm not sure what the real cause of the error is... Could a change in how MythTV is writing to files and handling errors have caused this problem to appear? Who knows. It's just a stab in the dark, but I'm thinking perhaps the occasional "link down" error has been there always for me, but some sort of change between MythTV 0.16 and 0.17 has caused it to not recover gracefully from that temporary error state? When I have received the infinite stream of "Stale NFS file handle" errors in the past, it has not required a restart of the NFS server or client. The NFS mount was still there and working properly. Restarting mythbackend was all that it took to fix it.
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