From: Joshua Hoblitt <jhoblitt@ifa.hawaii.edu>
Subject: NFS client request failure statistics?
Date: Fri, 1 Jun 2007 14:33:40 -1000
Message-ID: <20070602003340.GA5482@ifa.hawaii.edu>
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Hello,

I was wondering if there is some existing means (systemtap, etc.) of
getting a count of NFS client requests that have "failed" after
exceeding the maximum number of retransmissions?  If there is no means
of getting at this information, I feel that it would be worth adding.
It should be a useful stat to have in addition to the retrans count when
tuning the timeo/retrans values.

I've spent a small amount of time poking around in the sources to see
how difficult it would be export this information to userspace.  It
appears that this would be non-trivial to do as it seems that the NFS
client code itself doesn't keep a count of failed requests and the
procfs interface (/proc/net/rpc/nfs) is auto-generated by the sunrpc
layer.  Is my analysis correct?

Cheers,

-J

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