> Any ideas, or suggestions for how else to find out what might be going
> on, would be much appreciated. I haven't found anything suggestive by
> searching.

This sounds a like you are waiting for a callback break to complete, or to time 
out. You should be able to verify this by looking at a tcpdump of traffic from 
the fileserver, or possibly by looking at the fileserver logs. Either of these 
will also allow you to identify the client which is in possession of the 
callback.

This often happens when a volume is being accessed simultaneously by a well 
connected machine, and one behind a badly configured NAT or firewall. If the 
machine behind the NAT is regularly accessing the volume (to check 
configuration files, dot file state or similar), then it will keep reacquiring 
the callback. However, when the callback is broken by the fileserver, the NAT 
prevents the client from seeing, and responding to the callback break. The 
fileserver will then wait until the callback timeout before returning success 
to the operation that caused the callback break.

Cheers,

Simon

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