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RE: [Linux-cluster] Configuring NFS on Red Hat Enterprise Linux 4AS / Cluster Suite / GFS 6.1



Bob, in looking through your document, first I'd like to say "Thanks". Job
well done.


Second, I have a question about how RHCS (either version) handles the rmtab.

At a glance it appears that the cluster simply keeps a copy of the rmtab for 
a given NFS instance sync'd wioth a copy on the exported filesystem itself. 

For a single point of entry for NFS failover, it's a no-brainer and simply
"works".

However, for a multi server config like you describe where all servers have a
piece of the pie so to speak, how do does the cluster keep from killing the
existing
rmtab file on the failover target. 

That is if I have serverA and serverB, both running clusterred NFS services,
and serverA
buys the farm, it seems that when the rmtab from serverA gets sync'd over to
serverB, then
serverB's rmtab gets squashed.

That's a very simplistic view of things but I've not taken the time to go
code diving
to ge the answer of "How, at a low level, is the rmtab handled"...


Thanks again for a good read.


Corey

-----Original Message-----
From: linux-cluster-bounces redhat com
[mailto:linux-cluster-bounces redhat com] On Behalf Of Robert S Peterson
Sent: Tuesday, May 23, 2006 6:27 PM
To: linux clustering
Subject: Re: [Linux-cluster] Configuring NFS on Red Hat Enterprise Linux 4AS
/ Cluster Suite / GFS 6.1

On Tue, 2006-05-23 at 16:53 -0400, Sutton, Harry (MSE) wrote:
> This seems like a fairly straightforward thing to do, but I'm having a 
> heck of a time accomplishing it.

Hi Harry,

Since I've got some experience in this matter, earlier in the year, I tried
to write an "NFS/GFS Cookbook" that was a nuts-and-bolts
("example-driven") approach to configuring NFS to work with Cluster Suite and
GFS exactly as you're describing.

So far, I haven't had much time to refine it and make it into an officially
sanctioned "Red Hat Document."  It's just a draft.  However, because I'm
seeing more questions about this lately, I've decided to make it available on
our cvs source directory here:

http://sources.redhat.com/cluster/doc/nfscookbook.pdf 

I hope this helps.
Just keep in mind: This is a draft.  There may be mistakes.
If you let me know what they are, I can fix the doc though...
Hope this helps.

Regards,

Bob Peterson
Red Hat Cluster Suite


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