[Dsg-halla_gem] [EXTERNAL] Re: SBS GEM process variables

[Stephen Wood]

If the rPi is only doing caput’s to signals on adaqsc, then it should be sufficient to set EPICS_CA_ADDR_LIST to adaqsc’s ip address.  (And set EPICS_CA_AUTO_ADDR_LIST=NO).  

I wouldn’t think having ethernet and wifi both active would be a problem as linux should choose just one route.

Ole does have a private network backchannel connecting his machines.  Because of that the “NO” setting is particularly important.

Steve


> On Jun 28, 2022, at 6:32 AM, Marc Mcmullen <mcmullen at jlab.org> wrote:
> 
> Hi Brad,
> 
> A week or so, I had them moved from the hall A eel s/n (192) to the hall A s/n (188) where the BB Rpi has been. 
> 
> I’ll get with Brian to make sure the shell environment settings are correct.  
> 
> Tomorrow, I’ll disable the wifi on that Rpi and see if that will fix the issue. 
> 
> Regards,
> Marc
> 
> From: Brad Sawatzky <brads at jlab.org>
> Sent: Monday, June 27, 2022 9:03 PM
> To: Marc Mcmullen <mcmullen at jlab.org>
> Cc: dsg-halla_gem at jlab.org <dsg-halla_gem at jlab.org>
> Subject: [EXTERNAL] Re: SBS GEM process variables
>  
> Hi Marc,
> 
> That warning is due to the PV been mirrored on the channel access
> gateway.  It is usually something of an inefficiency, but not fatal.
> However, failure to pay attention to this kind of thing can cause PV
> mirroring loops as a corner case.
> 
> In general you want something like the following in your shell environ:
>   export EPICS_CA_ADDR_LIST="129.57.191.255 129.57.164.255 129.57.192.255 129.57.255.11"
> The first three are gateway/broadcast addresses for Hall A networks.
> The last is the "Hall A" channel access gateway that provides a bridge
> to PVs outside the Hall A networks.
> I believe it is considered best practice to also set:
>   export EPICS_CA_AUTO_ADDR_LIST=NO
> 
> 
> I did a 'caget' myself from within the Hall A network and got a bit of
> an odd response:
>   adaq at adaq2 2038% caget HAGEM:SBS:gas:ch41
>   CA.Client.Diagnostic..............................................
>     Message: "Ambiguous channel host (multiple IOC's have a channel by that name)"
>     Severity: "Warning" Context: "Channel: HAGEM:SBS:gas:ch41 Accepted: adaqsc-xb.cha.jlab.org:5064 Rejected: adaqsc.jlab.org:5064 "
>     Source File: ../service.c Line Number: 910
>   ..................................................................
>   HAGEM:SBS:gas:ch41            0.793
> 
> The response is from adaqsc-xb.cha.jlab.org.  That hostname resolves to
> 10.58.164.210, which is some internal subnet.  That seems a little odd
> to me.  I'm not sure what is going on there, but Ole Hansen would be
> able to tell you.  (I would have expected an RPi address on the 192 or
> 164.)
> 
> Have you updated the IP address for anything moved into the Hall (RPis,
> etc) to get them off the 'dev' subnet and on to an appropriate Hall
> network?
> 
> Note that you may also see weird results if you have both the wired and
> wifi interfaces active.  The wifi interface on the RPi should be
> permanently disabled.
> 
> -- Brad
> 
> 
> On Mon, 27 Jun 2022, Marc Mcmullen wrote:
> 
> > Hi Brad,
> > 
> > Since the SBS Rpi was moved to the hall I have noticed a warning about the
> > pressure PVs during testing. Are there multiple servers running the HAGEM
> > PVs?
> > 
> > CA.Client.Exception...............................................
> > 
> >     Warning: "Identical process variable names on multiple servers"
> > 
> >     Context: "Channel: "HAGEM:SBS:gas:ch41", Connecting to:
> > adaqsc.jlab.org:5064, Ignored: cagwops.acc.jlab.org:5064"
> > 
> >     Source File: ../cac.cpp line 1320
> > 
> >     Current Time: Mon Jun 27 2022 10:17:39.155967571
> > 
> > 
> > 
> > Regards,
> > 
> > Marc McMullen
> > 
> > Sr. Instrumentation Designer
> > 
> > Detector Support Group
> > 
> > (757) 269-7738 <tel:(757) 269-7738>
> 
> -- 
> Brad Sawatzky (he/him), PhD <brads at jlab.org> -<>- Jefferson Lab/SciComp/C111
> Ph: 757-269-5947 <tel:757-269-5947>  -<>-  Fax: 757-269-5235 <tel:757-269-5235>  -<>- Pager: brads-page at jlab.org
> The most exciting phrase to hear in science, the one that heralds new
>   discoveries, is not "Eureka!" but "That's funny..."   -- Isaac Asimov
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