Alan,
A frequent cause of this type of problem occurs when the
client is off subnet from the server, the client can reach
the server via the EPICS_CA_ADDR_LIST, but the client does
not see the server's beacons (because of how the server's
beacon address list is configured).
If the client does not find its PV after about 15 min then
it stops searching altogether until it see a beacon anomaly
( a significant change in a server's beacon ).
Of course the primary cause of these problems is that directed
broadcasts do not cross routers well. The solution in the future
may be to use multicasting.
Another solution is to use the CA gateway to reach off subnet
servers.
The R3.14 program casw can be used to monitor server beacon
anomalies.
Jeff
> -----Original Message-----
> From: Allan Honey [mailto:[email protected]]
> Sent: Monday, September 09, 2002 1:20 PM
> To: Jeff Hill
> Cc: Al Conrad; 'EPICS Tech-Talk'
> Subject: CA problem
>
>
> Aloha
>
> We at Keck are also having what appears to be CA problems.
>
> In our case a client may lose connection to a subset of its
> open channels. The connections never restore and the client
> must be restarted. If one starts other clients, which connect
> to the same channels, that new client has no problems whilst
> the original client continues to be disfunctional.
>
> This problem affects various systems running on different
> SUN workstations at different times. I am currently using
> a network snooping tool to try understand what is occurring.
>
> I am unsure if the problem is in CA repeater or the servers in the
> realtime systems but I suspect the repeater. Of course I am fairly
> ignorant of the CA repeater. The occurrence is very infrequent so
> it is hard to force the problem in order to study it.
>
> If anyone has any experience with this problem or tools, which
> may help, please give me a yell.
>
> Allan
- References:
- CA problem Allan Honey
- Navigate by Date:
- Prev:
CA problem Allan Honey
- Next:
Re: CA problem (Pedro Gigoux) Bernd Schoeneburg
- 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
- Navigate by Thread:
- Prev:
CA problem Allan Honey
- Next:
Re: CA problem (Pedro Gigoux) Bernd Schoeneburg
- 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
|