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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