[Linux-cluster] SOS - Can we use mixed GFS cluster?

[Lee X]

Thanks for the information.  It helps.

I probably should provide more information with my
previous email.  We are still using old kernel.  Is it
okay if we set up the following three GFS nodes in the
same cluster?  

Node1: GFS-6.0.2-25 with RHEL3U4
Node2: GFS-6.0.2-25 with CentOS 3.8
Node3: GFS-6.0.2.36-1 with CentOS 3.8

Regards,
BJ
--

--- Bob Peterson <rpeterso at redhat.com> wrote:

> On Fri, 2008-01-25 at 12:57 -0800, Lee X wrote:
> > Hi,
> > 
> > I would appreciate it if some one could tell me if
> > it's okay to use a mixed GFS cluster.
> > 
> > Say there are three nodes in a GFS cluster.  One
> use
> > GFS-modules-6.0.2-25 and other other two use
> > GFS-modules-6.0.2.36-1.  If not, why?  If yes, are
> > there any potential problems?
> > 
> > Regards,
> > BJ
> > --
> 
> Hi BJ,
> 
> The ondisk format of GFS has not changed, so you
> should be okay
> mixing different versions of GFS.  Having said that,
> you should
> be more concerned with the rest of the cluster
> infrastructure.
> 
> There was a cman protocol change between RHEL4U1 and
> RHEL4U2 
> (and similar releases for other distros) that makes
> it impossible
> to mix those within a cluster.  However, versions
> after that are
> compatible between major releases.  So in theory,
> the cluster
> infrastructure in RHEL4.2 will play nice with
> RHEL4.3, RHEL4.4,
> RHEL4.5, Centos 4.4, Centos4.5, and so on.
> 
> However, you still cannot have RHEL4.x nodes and
> RHEL5.x nodes
> in the same cluster.
> 
> The ondisk format for GFS has not changed between
> releases,
> so in theory you could even take a SAN that was
> formatted and used by
> a RHEL4.x cluster and move the storage over to a
> RHEL5.x cluster,
> or upgrade the whole cluster from RHEL4 to RHEL5.
> 
> Regards,
> 
> Bob Peterson
> Red Hat GFS
> 
> 
> --
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>
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> 





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