[Linux-cluster] Please correct me if I'm wrong, but...

Randy Brown Randy.Brown at noaa.gov
Mon Aug 20 20:25:32 UTC 2007

Thanks for the info.  I'm confused about one thing, though.  I was given 
approval to buy the Cluster suite for RHEL 5, but was told by our 
reseller that GFS was not included in the Cluster Suite and that GFS was 
about 4x as expensive as the Cluster Suite.  It seemed silly to me that 
GFS would be a separate purchase and be SO much more expensive. (I 
believe Cluster Suite was quoted at  about $500 per copy and GFS, or 
whatever we had to buy to get GFS was around $2200 per copy).  GFS seems 
like the way to go, but we can't afford $6000 for both the cluster suite 
and GFS if that's the case.  If it's included in RHCS, we may be in 


Michael Patrimonio wrote:
> Randy,
> My application is slightly different, but I went through all of this very recently, and depending on a couple of variables, the answer may be; "no, you do not need GFS."
> I am in the process of configuring a two-node cluster, with each acting as an NFS server. In the event of a node failure, the surviving node takes ownership of the file systems and exports them as NFS shares. Initially, we built the systems with RHEL 4 Update 4 and Cluster Suite. Our initial attempts to build the NFS services did no go well because of problems with this version of Cluster Suite's NFS facility. Red Hat support suggested going back to RHEL 4 Update 3, which was not an option for us, so we built a partially manual failover.
> But then RHEL4 Update 5 and RHEL5 were released, and we now had two options:
> 1 - Update to the RHEL4 U5 release to configure service with NFS as it was originally designed. According to Red Hat support, the Cluster Suite NFS "bug" introduced with the RHEL4 Update 4 release was fixed in RHEL4 Update 5, but not RHEL5.
> 2 - Update to RHEL5, which repackages the whole Cluster Suite product with GFS bundled into it at no additional cost. Prior to this, GFS had to be purchased. This would have added a layer of complexity to the configuration we don't need at this time.
> You may want to wait for someone else to address the "continuity" component of your question.
> I hope this helps.
> Regards,
> Michael
> P.S.--According to the documentation, the RHEL4 Update 3 release had a working "NFS" facility and a utility to import the NFS configuration from the existing /etc/exports file. Unfortunately, this was dropped with RHEL4 Update 4 and not restored with Update 5. This would have made this build of this configuration so much easier. Oh well.
> =====
> ________________________________
> From: linux-cluster-bounces at redhat.com on behalf of Randy Brown
> Sent: Mon 8/20/2007 15:26
> To: linux clustering
> Subject: [Linux-cluster] Please correct me if I'm wrong, but...
> in order to configure a two-node high availability NFS failover cluster,
> I need to use GFS, correct?
> I am wanting to configure two machines in a cluster and use them as a
> NAS head for an ISCSI based storage unit  providing NFS file systems to
> the machines on our network.  I'd like to have the units configured so
> if one fails, the other takes over and no interruption to the nfs mounts
> (high-availability failover). Everything I'm reading indicates that GFS
> would be required to do this, but would like confirmation.  In case I'm
> just missing something.  Worst case, I guess I could just have our
> second machine set up and ready to go as a warm spare.
> Any thoughts or suggestions would be greatly appreciated.
> Thank you,
> Randy
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