Re: [EXTERNAL] Re: How to archive PVs regularly even if they are not updating

[Ralph Lange via Tech-talk <tech-talk@aps.anl.gov>]

On Mon, 26 Sept 2022 at 18:17, Mark Rivers <rivers@cars.uchicago.edu> wrote:

 

Ø  For rarely-moving things, it just blows up the file with redundant identical samples.

 

That is not my interpretation of what Kay said:

Ø  Instead, it would for example scan once every 5 minutes, and then write whatever the most recently received sample was .. if it changed.

 

That means it should not fill up the file, because it does not write anything if it has not changed.

Ok.

And since changed means either a new timestamp or a new value, setting ADEL=-1 would fill up the file even for a non-changing PV, with the SCAN/MONITOR setting only affecting the rate of filling it up.

I will understand it eventually. I'm confident.

Thanks!
~Ralph