[Linux-cluster] Cluster Suite 4 to 5 upgrade?

[Gordan Bobic]

Doug Tucker wrote:
> I have a RHCS currently on RH 4.8. My question is 3 part. Is it possible
> to join a RH 5.4 cluster machine to a 4.8 cluster?

In a word - no.

> If not, is there any
> upgrade path that does not compromise the data? IOW, could I take the
> backend storage currently running on the 4.8, and connect it to a new
> 5.4 without data loss?

I presume you mean that you have a GFS volume on a SAN that you want to 
keep after the upgrade. I'm not 100% sure (perhaps someone from RH here 
could confirm), but I believe the on-disk GFS format is the same between 
the versions that ship with RHEL 4.8 and 5.x. Note that you still won't 
be able to have the volume mounted on both 4.x and 5.x machines at the 
same time.

> Or, can I do an "upgrade" of the existing
> cluster machines from 4.8 to 5.4?

AFAIK, the "upgrade" process isn't supported. It might work, but the 
chances are that you'll be better off doing a clean install and copying 
the minimum required configs over.

Gordan