Experimental Physics and
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<== Date ==>		<== Thread ==>

Subject:	Re: [EXTERNAL] Re: How to archive PVs regularly even if they are not updating
From:	"Kasemir, Kay via Tech-talk" <tech-talk at aps.anl.gov>
To:	EPICS Tech Talk <tech-talk at aps.anl.gov>, Ralph Lange <ralph.lange at gmx.de>
Date:	Mon, 26 Sep 2022 15:13:06 +0000

On Mon, 26 Sept 2022 at 15:02, Shankar, Murali via Tech-talk <tech-talk at aps.anl.gov> wrote:

The EAA uses camonitors for both SCAN and MONITOR requests.

> If that's the case (noticeable change of behavior compared to the older archivers) - what is the difference between the two options?

I don't think it's a change from the Channel Archiver nor the RDB-based archive engine.

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.

-Kay

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

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ANJ, 26 Sep 2022