[Info-vax] Distributed and Clustered App Design

[Phillip Helbig undress to reply]

In article <rt2g2n$5be$1 at dont-email.me>, Dave Froble
<davef at tsoft-inc.com> writes: 

> > Yes, a VMS-cluster needs a lot of bits and pieces just to run in itself.
> > That does not mean that all application today needs the same features.
> > Not even an application that "used" a cluster 20-30 years ago.
> 
> When first introduced VMS cluster was to some extent a method to add 
> compute resources, just as adding disk drives added storage resources. 
> Not exclusively, but a major thing, then.  Later other reasons to use 
> VMS cluster rose in significance, and as compute capabilities got 
> better, the "add compute resources" became less important.
> 
> The reasons to use VMS cluster has changed over time, and is still changing.
> 
> I had a customer with a room full of VAX 11/780 systems, six I believe, 
> in a VMS cluster configuration.  Being in one room, disaster tolerance 
> was obviously not a desired configuration.  That was then.

Off the top of my head: adding resources, disaster tolerance, rolling 
upgrades, satellites (yes!).  Many reasons.  Not all folks will have all 
reasons.