[Info-vax] OS implementation languages

[Bob Gezelter]

With regards to mass storage, I will note that using recent generation HPE storage arrays and rx2800 i6 servers, I did not find it difficult to push mass storage load to the point that the storage controllers were "heavily" loaded and not "amused". 

To make the storage controllers happy, I had to throttle things back a bit.

A fair number of client matters in my consulting practice have related to performance. In so far as mass storage I/O is concerned, my experience over the past three decades has been that almost all OpenVMS "mass storage" performance problems have root causes of poor parameters, not any particular quirk of OpenVMS or RMS. The poor parameter choices run the gamut including page limits; file organization, RMS parameters, disk volume configuration, and many others. I have seen a fairly broad sample over the years. A reconsideration can often increase performance significantly. 

That is not to say, as I did in my Ph.D. dissertation and the referenced paper that OpenVMS can do better. Even in out present fairly well-resourced environments, compute cycles are better used to productive work, not unnecessary overhead. We can and should do better.

- Bob Gezelter, http://www.rlgsc.com