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<== Date ==> <== Thread ==>
Subject: Re: archiver appliance - PVs not reconnecting
From: "Hu, Yong via Tech-talk" <tech-talk at aps.anl.gov>
To: Pierrick M Hanlet <hanlet at fnal.gov>, "tech-talk at aps.anl.gov" <tech-talk at aps.anl.gov>
Date: Thu, 3 Aug 2023 18:41:17 +0000

Hello Pierrick,

We had this kind of issues at NSLS-2. I usually go to the log files (archiver-installation-directory/engine/logs) to troubleshoot those PVs (grep pvName *). In our cases, most issues are actually related to the IOCs after rebooting: the timestamps of not-auto-reconnected PVs are totally wrong; the record types are changed; the PVs are updating faster; etc.

You do not need to remove those PVs to re-archive them. I usually pause then resume them. If you do want to remove those PVs being archived from the web interface, I think there is a pop-up window warning if you want to delete the data as well. It is a common sense that the historical archived data should be kept unless users specifically delete them.

HTH,
Yong

From: Tech-talk <tech-talk-bounces at aps.anl.gov> on behalf of Pierrick M Hanlet via Tech-talk <tech-talk at aps.anl.gov>
Date: Thursday, August 3, 2023 at 11:40 AM
To: tech-talk at aps.anl.gov <tech-talk at aps.anl.gov>
Subject: archiver appliance - PVs not reconnecting

This problem is similar to
https://epics.anl.gov/tech-talk/2020/msg01951.php, but not the same.

I have an archiver appliance which has been happily running on a Alma
Linux server for several months. We had a
maintenance shutdown  which turned off the IOC servers, but the archiver
remained active.  When the system
came back up again, ~150 PVs, which I verified as alive and active,
would not reconnect, whereas thousands more
did reconnect as usual.  Any ideas?

Question: If I remove these PVs from the archiver and then add them back
in, will we lose historical data?
Many thanks,
Pierrick

--
Pierrick Hanlet
Fermi National Accelerator
Accelerator Front End Controls
+1-630-840-5555 -- lab
+1-312-687-4980 -- mobile

"Whether you think you can or think you can't, you're right" -- Henry Ford

References:
archiver appliance - PVs not reconnecting Pierrick M Hanlet via Tech-talk
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