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mixed-version cluster

Ron Maillet
Occasional Contributor

mixed-version cluster

I have a customer that has a 4-node cluster.
2 VAXes are running VMS 6.2.
2 Alphas are running VMS 7.3-1.

The customer wants to upgrade the Alphas from 7.3-1 to 7.3-2 using separate system disks, using the rolling upgrade, while the VAXes stay up (6.2).

If the upgrade "rolls" there would be a point where there would be 3 versions of VMS. I seem to have read somewhere where you cannot have more than 2 versions ever, even through rolling upgrades. Is this true?


-Ron Maillet-
VMS Support
Jan van den Ende
Honored Contributor

Re: mixed-version cluster


since Vax versions are not always synchronous ty AXP versions, such 3-version situations are inevitable (there only exists Vax 7.3, no sub-versions).
That said, I have serious doubts about any 6.2 <-> 7.3(-x) combination, but you ARE already running that.

But, there is a _WIDE_ gray area between "supported" and "may work".
Since you already ARE running Vax6.2 plus Alpha7.3-x, there definitely is _NO_ code that forbids it.
So, your chances are good, but, _IF_ things go wrong, you ARE on your own!

Should you decide to do it, will you report back here?



Have one on me.

Don't rust yours pelled jacker to fine doll missed aches.
Karl Rohwedder
Honored Contributor

Re: mixed-version cluster

Since this combination is unsupported, be sure your backup is o.k.!

regards Kalle
Kris Clippeleyr
Honored Contributor

Re: mixed-version cluster

I'm not sure of the combination VAX 6.2 and Alpha 7.3-2, but from my own experience the combination VAX 7.3, Alpha 7.3-2 (or 8.2) and IA64 8.2-1 hasn't given any trouble up till now. I wouldn't recommend it though in a production environment.
Kris (aka Qkcl)
I'm gonna hit the highway like a battering ram on a silver-black phantom bike...
Ian Miller.
Honored Contributor

Re: mixed-version cluster

It should be fine. Probably not supported.
Purely Personal Opinion
Donald Hill

Re: mixed-version cluster

We also have a mixed cluster- currently a 9 member cluster made up of a mix of VAX, Alpha and occasionally a I64 machines. We currently run VAX 7.3 with a mix of Alpha 7.3-1, 7.3-2 and now 8.2, and we occasionally bring in a VAX 6.2 or a I64. We have been running this type of configuration for many years with no problems. We are using it in a development/ test arrangement - not production.

Don Hill