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

Subject: RE: CA LINK's not monitoring.
From: Nick Rees <[email protected]>
To: Jeff Hill <[email protected]>
Cc: [email protected], Peregrine McGehee <[email protected]>
Date: Thu, 18 Nov 1999 17:41:10 -1000 (HST)
On Thu, 18 Nov 1999, Jeff Hill wrote:

> I must admit that we recently saw a very similar situation
> here in one of our systems, and we are still attempting to track
> it down.
> 
> We are currently attempting to isolate between:
> o the CA server code
> o the DB CA link code
> 
> I have been looking carefully at the CA server and I don't see it. Bob
> has also been looking at the DB CA link code.
> 
> > I reset one of the link fields in the record doing the monitoring (it was
> > a Calcout record and had many CA input links from more than one other
> > machine) by writing the the current value of the link to it. This seemed
> > to free things up and all the CA monitored values in that record got set
> > to the current values.
> 
> If you poked, on the server side, the input that had a different value than
> what was expected on the client side then it could be either CA or the DB
> CA link code. If you poked, on the server side, some other input whose
> state was properly reflected on the client side and things got better then
> I would expect the DB CA link code (or possibly the CA client library) is
> at fault.

I did the following:

1. I poked a new PV value on the server side and it didn't appear on the
   client side.

2. On the client side I changed the input link back to itself.
   Specifically, I did:

   -> dbpf "mcu:fcalc.INPE","ws:trus_leg_ene:val.VAL NPP NMS"

   This had the effect of somehow clearing up all the input links in the
   record - none of them had been updating before, and all of them
   suddenly updated to current values. Whether they continued to update
   properly, I don't know, I didn't have the time to monitor it.

Hence, I decided it had to be either the CA client, or the CA record
support software. Anyway, it was on the client IOC, not the server (dm
screens attached to the server PV's worked fine too).

> > I finally rebooted the IOC to clear everything up.
> >
> what was the functionality that could not be restored without a reboot?

None. It was just that I had isolated the problem to the CA client on a
particular IOC, and so I decided to reboot it in case there were any other
problems - we lost two hours of time to this last night and so I had to be
extra sure that there wasn't any other problems lurking around.

> I will look at this in further detail tomorrow.

Thanks.

Nick Rees

Joint Astronomy Centre               Ph:       +1 (808) 961-3756
660 N. Aohoku Place                  Fax:      +1 (808) 961-6516
Hilo, HI.  96720                     Internet: [email protected]



References:
RE: CA LINK's not monitoring. Jeff Hill

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