[CentOS] Two NFS issues

Russell Miller duskglow at gmail.com
Mon Dec 1 14:10:52 UTC 2008


All 5.2 versions have this problem.

--Russell

On Mon, Dec 1, 2008 at 11:03 AM, Akemi Yagi <amyagi at gmail.com> wrote:

> On Mon, Dec 1, 2008 at 10:32 AM, Russell Miller <duskglow at gmail.com>
> wrote:
> > Hi, I was hoping someone would have an idea of what's going on here...
> >
> > We have two NFS issues.  One of which is certainly centos based, one of
> > which we're not sure of.
> >
> > First issue is:  As of Centos 5, we can't make simultaneous access to a
> > directory via NFS.  To duplicate, I cd into a share in two windows, copy
> a
> > 1G file in the first window, and just do an ls in the other.  The ls will
> > hang until the write is done.
> >
> > Turning off apic seems to help a little, but there's still a very
> > significant hang.
> >
> > This problem is not apparent in centos 4.x, even when mounting to the
> same
> > NFS server.
> >
> > The other problem is - we're seeing tremendous slowdowns when going
> through
> > an Acopia NFS virtualization server.  These slowdowns got much more
> severe
> > when we moved to Centos 5.2.  If we connect to the NFS appliance
> directly,
> > these slowdowns don't exist.
> >
> > Has anyone seen problems like this?  How did you solve them?
>
> What is the version of your kernel?  There are (used to be) known
> issues with NFS in certain versions of the CentOS-5 kernels.
>
> Akemi
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