Experimental Physics and
Industrial Control System

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

Subject:	What is serving these PVs?
From:	David Bracey via Tech-talk <tech-talk at aps.anl.gov>
To:	"tech-talk at aps.anl.gov" <tech-talk at aps.anl.gov>
Date:	Wed, 27 May 2026 17:54:10 +0000

I have all of the servers disabled on this IOC:

epics> dbsr

No server layers registered with IOC

epics> dbl

ABC:XYZ_CTRL_SYS:AMP

ABC:XYZ_CTRL_SYS:FREQ

ABC:XYZ_CTRL_SYS:TIME

ABC:XYZ_CTRL_SYS:COS

ABC:XYZ_CTRL_SYS:SIN

However the PVs are still being served:

dbracey@xyzzy:~$ pvxget ABC:XYZ_CTRL_SYS:AMP

ABC:XYZ_CTRL_SYS:AMP

value double = 10

alarm.severity int32_t = 0

epics> epicsPrtEnvParams

EPICS_IOC_IGNORE_SERVERS: rsrv qsrv2

I am just guessing at how things work, so I must have made a wrong assumption.

Can someone explain what’s going on?

Dave Bracey, Fermilab

Navigate by Date:: Prev: Inquiry about replacing SIS3820 with USB-CTR08 for 6-channel data acquisition zhaoying--- via Tech-talk; Next: Re: What is serving these PVs? Ralph Lange via Tech-talk; Index: 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 <2026>
Navigate by Thread:: Prev: Inquiry about replacing SIS3820 with USB-CTR08 for 6-channel data acquisition zhaoying--- via Tech-talk; Next: Re: What is serving these PVs? Ralph Lange via Tech-talk; Index: 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 <2026>

ANJ, 27 May 2026