Re: Upcoming time boundary events

Arne Vajhøj used his keyboard to write :

On 6/3/2025 4:25 AM, Marc Van Dyck wrote:

Arne Vajhøj expressed precisely :

On 6/2/2025 4:34 AM, Marc Van Dyck wrote:

Arne Vajhøj has brought this to us :

But again my impression is that often the VMS systems are in same
server room and no routing required.

>
Several OpenVMS systems today are used in disaster-tolerant
configurations. That implies at least two different locations.

>
True.
>
But at the risk of sounding like a broken record, that is also
something I got the impression is getting rarer.
>
But I don't know.
>
How many multi-site VMS clusters do you know?

 At least the one that I was in charge of before I retired last year.
Two sites, 3 main applications, 3 production clusters, 3 other ones
on a distant site for disaster tolerance, 3 test systems, one for
development, two clusters for system management, and two for system
testing/crash & burn activities. FC storage with asynchronous long
distance replication. Backups on shared robots. Lots of fun...

>
Dan just posted a question on the VSI forum about a 6 node cluster.
So clusters do exist.
>
I just see very few questions related to clusters. But maybe system
managers running clusters are generally more competent than average.
>
And very few need clusters for load volume leaving mostly HA reason.
>
Arne

Indeed. Clusters used the be a way to add compute power by horizontal
scaling, because vertical scaling was either impossible or unaffordable.
Today compute power is cheap, so clustering is mostly a high
availability tool. With the consequence that large number of nodes have
largely disappeared ; most clusters are now two or three (if you don't
want a quorum disk) nodes only. I still remember the development cluster
I ran 25 years ago, a large LAVC with some 50 satellites that used to
take half a day to reboot...
--
Marc Van Dyck