On Sep 24, 2010, at 8:52 AM, Andrew Johnson wrote:
> On Friday 24 September 2010 10:34:28 Eric Norum wrote:
>> I don't understand the issue.
>> We run multiple soft IOCs on the same linux box all the time. They each
>> get a port assigned by the kernel. caRepeater takes care of fanning out
>> the UDP requests for PV information. "It just works".
>
> ... unless someone configures a client with EPICS_CA_AUTO_ADDR_LIST=NO and
> EPICS_CA_ADDR_LIST pointing to the IP address of that linux box. With that
> configuration each individual CA name search UDP message gets routed by the IP
> kernel to only one of the IOCs, and depending on the particular kernel that
> might always be the same IOC (thus hiding the other IOCs from that client) or
> it might round-robin between IOCs, making connection times longer.
Ah, right.
>
> One solution that I don't think anyone has suggested yet would be to run a CA
> name-server on each IOC box at the official port number, and have it know
> about and forward searches to all the IOCs on that particular box, or use the
> "dbl > file" approach on each IOC so the name-server knows all the PVs
> directly. This needs no special configuration on the part of the clients,
> they can use broadcasts or directed UDP as they wish, and there's no single
> point of failure for the control system as a whole (assuming the name servers
> get started when each machine comes up).
Or run every IOC in it's own virtual machine?
--
Eric Norum
[email protected]
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