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<== Date ==> <== Thread ==>
Subject: Re: [EXTERNAL] Re: How to archive PVs regularly even if they are not updating
From: Ralph Lange via Tech-talk <tech-talk at aps.anl.gov>
To: EPICS Tech Talk <tech-talk at aps.anl.gov>
Date: Mon, 26 Sep 2022 17:47:09 +0200
On Mon, 26 Sept 2022 at 17:13, Kasemir, Kay <kasemirk at ornl.gov> wrote:
MONITOR:  Channel uses monitor (for ADEL threshold) and tries to save every received value.
SCAN:  Channel uses monitor (for ADEL threshold) and then saves the most recently received value every SCAN period.

SCAN does not perform a get or get-callback every SCAN period, and it also doesn't save the time of when it was scanned.
Instead, it would for example scan once every 5 minutes, and then write whatever the most recently received sample was .. if it changed.

Pardon my archiver ignorance and thanks for the explanation.
Of course: SCAN mode intends to limit the number of samples written to file for fast-moving things with small ADEL. For rarely-moving things, it just blows up the file with redundant identical samples.

Sorry for the noise.
~Ralph
Replies:
RE: [EXTERNAL] Re: How to archive PVs regularly even if they are not updating Mark Rivers via Tech-talk
References:
Re: How to archive PVs regularly even if they are not updating Shankar, Murali via Tech-talk
Re: How to archive PVs regularly even if they are not updating Ralph Lange via Tech-talk
Re: [EXTERNAL] Re: How to archive PVs regularly even if they are not updating Kasemir, Kay via Tech-talk
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