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<== Date ==> <== Thread ==>

Subject: Re: Notification of Archiver Appliance interruptions
From: Michael Davidsaver <mdavidsaver@gmail.com>
To: will.rogers@diamond.ac.uk, tech-talk@aps.anl.gov
Date: Mon, 18 Sep 2017 18:39:41 -0500
On 09/18/2017 05:25 AM, will.rogers@diamond.ac.uk wrote:
> Hi all,
> 
> If I restart the Channel Archiver, I get events stored in the data to show that PVs were disconnected and subsequently reconnected.  This gives me information that the archive may have missed certain events.  Client tools can handle this information as they choose - the Channel Archive Viewer shows a gap in plotted data, but our version of the CS-Studio data browser doesn't.
> 
> If I do a similar thing with the Archiver Appliance, I don't seem to get any such information.  This suggests that we wouldn't know if events have been missed.
> 
> Is this difference in behaviour intentional?  I could easily be missing something.

Yes, although it isn't obvious.  Look for a FieldValue named
"cnxlostepsecs" attached to the event following a disconnect.  This is
the time at which the connection was lost (seconds part only).

Personally I prefer having special events.  So my carchivetools
retrieval scripts translate these into the special events
(severity=3904) that you're expecting.

https://github.com/epicsdeb/carchivetools

References:
Notification of Archiver Appliance interruptions will.rogers

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