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SubjectRe: intermittent NFS hangs from NetApp
Well, lucky for me, I convinved my boss to let me upgrade the kernel to
2.2.13 2 days ago which has apperantly fixed this problem. No more
hangs. I'm considering this problem closed and tonight my boss is
buying me dinner ;)


Alan Cox wrote:
>
> > When the problem occurs, all processes that touch the mount are
> > indefinitly hung. Errors in messages show up:
> > Feb 24 18:08:04 dhp0020 kernel: nfs: server 192.168.0.253 not
> > responding, still trying
> > Feb 24 18:08:04 dhp0020 kernel: nfs: server 192.168.0.253 not
> > responding, still trying
>
> As far as its concerned the netapp isnt talking
>
> > The problem is immediately solved with a simple umount -f; which fails
> > because of the current processes, but it fixes the hang! When I do
> > umount -f, all of the waiting processes get a failed read, but they
> > continue normally.
>
> That suggests a wakeup got missed somewhere. It doesnt fit the netapp
> not talking. Either the netapp is losing a consistent request or it is
> the nfs client in the kernel. Both are possible, only doing some network
> dumps (tcpdump with -l 1514 and asked to decode NFS frames) done when it
> starts hanging would tell

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