[Info-vax] Command to show process rms file opens?

[Bob Gezelter]

On Thursday, July 30, 2020 at 1:44:08 PM UTC-4, IanD wrote:
> There's a number of detailed studies of SSD drives versus HDD reliability
> 
> https://www.usenix.org › filesPDF
> A Study of SSD Reliability in Large Scale Enterprise Storage Deployments - Usenix
> 
> There is no definitive answer is one better than the other, horses for courses yet again it seems

Ian, 

Quite.

However, I must re-emphasize my previous comment: Do the science first.

I say that for a simple reason. I hate to be the person who spends funds for a hardware change, only to find that the problem is elsewhere. A Britishism I heard summarizes this well: Awkward that.

In my many years of practice, I have seen far too many situations where a performance problem was, in truth, nothing worse than an unconsidered, or inadequately in retrospect, considered quota or parameter. 

WADR, switching HDD for SSD eliminates latency, and arm movement. No dispute. But performance may not increase if the working set was set at the wrong value. Similarly, we have seen more than a few episodes of poorly structured directories causing a performance problem on comp.os.vms. 

Doing the science first ensures that one does not expend monetary or political capital unnecessarily.

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