Re: [EXTERNAL] Problems with the alarm-server and large number of channels

["Hartman, Steven via Tech-talk" <tech-talk at aps.anl.gov>]

Hi Merrill—

Are both of your IOCs running on the same computer, and are you using that server’s IP address to specify the CA address list for your Phoebus configuration? 

I suspect the problem may be your channel access network configuration. See https://docs.epics-controls.org/en/latest/sys-admin/configure-ca.html for "Multiple IOCs on the same computer”. 

The simplest solution is to specify a broadcast address instead. I believe the relevant phoebus preference is "org.phoebus.pv.ca/addr_list"

-- 

Steven Hartman

hartmansm at ornl.gov

On Jun 26, 2025, at 10:01 AM, Charles Jenkins via Tech-talk <tech-talk at aps.anl.gov> wrote:

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Hello Everyone,

I am working on setting up the Phoebus alarm-server for the Mu2e 
experiment.

I have a simulated EPICS IOC that I use to develop a Phoebus 
alarm-server (this includes setting up zookeeper and kafka).  I have 
been able to successfully set up the alarm server for one large 
sub-system, but when I add a second large sub-system I get 
"UNDEFINED/Disconnected" messages for process variables on the alarm 
tree and "UNDEFINED" for these process variables in the alarm table.  If 
I include just one of these large subsystems I do not get these 
messages.  Messages from the alarm-server itself says "connection timed 
out" for the channels.  If I type "ls" in the alarm-server terminal, 
these alarm topics say "UNDEFINED" . Meanwhile a "caget"of channels from 
EPICS (the simulated IOC) gives values that I had set previously before 
starting the alarm-server and Phoebus.

Can anyone provide a clue as to what I am not setting up correctly?

Thanks,
Merrill Jenkins

-- 
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Merrill Jenkins
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