Re: PV gateway

[Ralph Lange <Ralph.Lange@bessy.de>]

To avoid ambiguity, channel names must be unique to a client. Your 
client obviously "sees" channels both directly as well as through the CA 
Gateway.

Possible ways to fix this problem include
- Setting up the environment for your client so that it sees the IOC 
either direct or through the Gateway (but not both) - based on IP networks
- Setting up the environment for the Gateway so that it does not see 
(and forward) IOCs in the local network - based on IP networks
- Setting up the PV list of the Gateway so that it does not forward 
channels from a local IOC - based on channel names

The correct solution depends on the structure of your network and the 
design of your application. You will have to properly identify your data 
sources and sinks (i.e. CA servers and clients) and their location in 
your network(s) to find out who should be supposed to see what through 
which path (Gateway or direct).

Once you know what you want to achieve, the CA Reference Manual (the 
sections on Environment Variables and WANs) and the Gateway Users Guide 
(sections on Access Security and Gateway Configurations) will provide 
you with the details of how to set up your clients and/or Gateways.

Hope this helps,
Ralph


Motoki Ooi wrote:

> Hello all
>
> I'm tring to use PV gateway but I have one trouble.
> Once use PV gateway with small number of record, PV gateway works well.
> But when use with large number of records ( over 200 ),
> some records are connected to PV gateway but other records connecet to
> EPICS IOC directry.
> It means some record say
> `DB CA Link Exception: "Identical process variable name on multiple
> servers",
> contest "Channel: "archive:wf83", Connecting to :
> ccnet307.tokai.jaeri.go.jp:5064, Ignored : 133/53/55/207:5064" '
> other records say
> `DB CA Link Exception: "Identical process variable name on multiple
> servers",
> contest "Channel: "archive:wf44", Connecting to : 133.53.55.207:5064,
> Ignored : ccnet307.tokai.jaeri.go.jp:5064" '.
> ccnet307 is EPICS IOC and 133.53.55.207 is PV gateway server.
>
>
> Thanks
>
> Motoki Ooi
>
>  
--
Ralph Lange               Ralph.Lange@bessy.de     Fon: +49 30 6392-2117
BESSY Controls Group      www.bessy.de             Fax:      ...   -4859