[Info-vax] Desirable features for VMS

[Dave Froble]

On 1/28/2024 8:32 AM, Arne Vajhøj wrote:
> On 1/28/2024 8:25 AM, Marc Van Dyck wrote:
>> Simon Clubley formulated the question :
>>> Does anyone have any others to add to the list ?
>>
>> Yes. Some kind of automatic disaster recovery. That is, if a process,
>> or a set of processes, run on a system that crashes, those processes are
>> automatically restarted on another cluster member, transparently, with
>> no manual intervention, and continue from the point they were at when
>> the system crashed. No transaction lost of any kind, and without having
>> to add anything in the code that those processes are running. The
>> operating system (or layered product) does all the work transparently.
>> Should work with code written 30 years ago, with ACMS applications,
>> anything.
>
> Something like Tandem NonStop lock-step?
>
> Arne
>
>

Well, no, not really.  What I'd envision would be what I'd call an application 
monitor, for lack of a better name, that would be able to know what the 
applications should be doing, to monitor that activity, and to do whatever 
necessary to continue the activity, should anything happen to that activity. 
Yeah, non-stop, but not the Tandem design.

Just a concept, and design and implementation might be "interesting".

I'd just note that the OSs would be included as applications, so re-starting 
them from where they were interrupted would be included in the concept.  So, 
yeah, the monitor would be outside/over the OSs.  Perhaps something like happens 
with VMs.  Except VMs want to move the activity to another system, not recover 
on the same system.

-- 
David Froble                       Tel: 724-529-0450
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