> Also, I'm not sure what would happen to the client if the
> particular gateway serving a PV stops .... would the client be able
> to automatically get the PV from the other gateway ?? I'm not sure.
The client library would eventually find the PV in the other gateway, and
connect through the other gateway. How fast it would switch over depends on
how it lost contact with the original gateway. If the network path to the
original gateway was severed it might take a relatively longer amount of
time to switch over - approximately as long as the TCP keep-alive interval
parameter specifies. If the gateway process is stopped, but its host is
still alive and responding on the network, then the client library would
take a relatively shorter amount of time to discover the problem and switch
over to the other gateway - approximately EPICS_CA_CONN_TMO seconds. The
software is specially designed to operate this way with recent versions of
R3.14 so that there isn't a tendency in EPICS systems for congestion
feedback.
Jeff
- Replies:
- Re: CA gateway question Artem Kazakov
- References:
- Re: CA gateway question Martin L. Smith
- Navigate by Date:
- Prev:
EDM X-Y graph rescaling Chestnut, Ronald P.
- Next:
Re: CA gateway question Artem Kazakov
- 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:
Re: CA gateway question Martin L. Smith
- Next:
Re: CA gateway question Artem Kazakov
- 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
|