Re: mixing OS versions?

Alan Brown <ajb2@xxxxxxxxxxxxxx> · Fri, 28 Mar 2014 22:07:48 +0000



    On 28/03/14 19:31, Fabio M. Di Nitto
      wrote:

    
      Are there any known issues, guidelines, or recommendations for having
a single RHCS cluster with different OS releases on the nodes?

      Only one answer.. don't do it. It's not supported and it's only asking
for troubles.


    Seconded. There are _substantial_ differences between Centos/RHEL 5
    and 6 clustering.

    
    You can run one or the other OS, but you can't mix them. The on-disk
    format isn't affected.

    
    Best path is to setup a cluster in 6, shut down the 5 cluster,
    attach disks to the 6 cluster and bring it all back up. The 5 boxes
    can be converted to version 6 afterwards.

    
    (I'm going through this at the moment, as I have 2 EL5 clusters and
    1 EL6 cluster.)

    
    TAKE NOTE:  RHEL/CentOS6 clustering is not quite ready for
    prime-time - if you enable GFS2 quotas and someone busts his quota
    the machine will panic.

    
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