[CentOS] Excessive NFS operations

[Lars Hecking]

nate writes:
> lhecking at users.sourceforge.net wrote:
> >
> >  Reading the "waiting IOs" thread made me remember I have a similar problem
> >  that has been here for months, and I have no sulution yet.
> >
> >  A single CentOS 5.2 x86_64 machine here is overloading our NetApp filer
> > with
> >  excessive NFS getattr, lookup and access operations. The weird thing is
> >
> 
> There was a kernel update in the 5.2/5.3 time frame that
> fixed a NFS client bug regarding lookups, what kernel are you
> running?
 
 2.6.18-92.1.22.el5. I can test all newer kernels if necessary.

> Have you tried running lsof on the client side to see which
> processes are using the files served over NFS?

 Yes, but there's simply too much output to make this useful, and most of
 it, about 75%, is related to EDA software which is installed on the filer.
 I.e. 3rd party software we have no control over and don't know what it
 does internally.