[Linux-cluster] Linux-cluster Digest, Vol 90, Issue 20

[Misha Mal]

trash draft

On Fri, Oct 28, 2011 at 11:00 AM, <linux-cluster-request at redhat.com> wrote:

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> Today's Topics:
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>   1. Re: Issue with NFS exports and "loopback" NFS mounts as RHCS
>      resources on attempted resource release (Rajagopal Swaminathan)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Thu, 27 Oct 2011 23:32:34 +0530
> From: Rajagopal Swaminathan <raju.rajsand at gmail.com>
> To: linux clustering <linux-cluster at redhat.com>
> Subject: Re: [Linux-cluster] Issue with NFS exports and "loopback" NFS
>        mounts as RHCS resources on attempted resource release
> Message-ID:
>        <CA+Ydgaq4sy9CmTjD=y_z=iiO5yO3BUDN2jTWMrjViSpND+UBEg at mail.gmail.com
> >
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>
> Greetings,
>
> On Thu, Oct 27, 2011 at 7:56 PM,  <Ralph.Grothe at itdz-berlin.de> wrote:
> > Hi Raj,
> >
> > yes, I know this SAP on RHCS document and have thouroughly read
> > it (I myself supplied the link in my initial posting).
> > But as I already wrote NFS isn't addressed in this document.
> > Instead it reads on page 32, Section 8.3.3 "NFS Mounted File
> > Systems", 2nd paragraph:
> >
> > "It is possible but not recommended or supported to run an NFS
> > server within the cluster. This
> > leads to a re-mount scenario in which the cluster node exporting
> > the NFS filesystems remounts
> > the same NFS exports. In low memory situations, the NFS server
> > and client can
> > negatively impact system stability."
> >
> > I know I should show them SAP admins this paragraph, and ask them
> > why they are trying to hold me accountable for not working
> > features or being deemed inapt to configure a cluster properly
> > for requested layouts the clustering software (viz. its agents)
> > isn't fit to deliver.
>
> I would understand SAP's uppity attitude if they are approached.
>
> > But this is the usual battle with users and customers, and I
> > already was coerced into violating cluster software just to make
> > it work as the customer thinks it ought to work a, couple of
> > times.
> >
>
> I can understand that too, been there done that.
>
> I apologise for I neither have a cluster nor have aSAP implementation
> in front of me to give you a more usable answer.
>
> But then, IIRC NFS can operate on UDP (connectionless) as well as TCP
> (connection-oriented and default)
>
> But I will keep quite on this thread further. Till I hear from the
> experts from Redhat or SAP. I get paid from neither.
>
> --
> Regards,
>
> Rajagopal
>
>
>
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> End of Linux-cluster Digest, Vol 90, Issue 20
> *********************************************
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