On 2017-03-11 11:58, Wilm Boerhout wrote:
Paul Koning schreef op 9-3-2017 om 23:59:
On Mar 9, 2017, at 12:15 PM, Mark Pizzolato <[email protected]> wrote:
On Wednesday, March 8, 2017 at 11:50 PM, Johnny Billquist wrote:
...
When Matt Burke initially was working on this, I believe that we
talked briefly
about extending sim_ether to support packet delivery across IP
multicast.
With that model, all of the systems connected to a particular star
coupler
would use the same multi-cast group. I think that DEC may have done
something very similar to this when they implemented LAVC. Several
independent Local Area VAX Clusters can certainly coexist on the same
LAN without interference.
No, LAVC is an Ethernet based protocol (it sits directly on top of
Ethernet). No routing layer, IP or otherwise.
You could tunnel it over Johnny's bridge protocol, of course.
paul
You could have a look at my VAX on Raspberry Pi / SIMH story at
https://www.linkedin.com/pulse/mixed-architecture-openvms-cluster-wilm-boerhout
The LAVC cluster is still running today, and will survive individual
systems missing (even the one voting member) when I upgrade Raspbian OS
and/or SIMH itself.
You missed Paul's point.
The initial idea/thought was about emulating CI using IP multicasting.
That can't be done without some additional glue.
LAVC was then mentioned as if it was done using IP multicasting, similar
to the suggestion about CI emulated over IP, which was incorrect. LAVC
is not using IP, and thus cannot use IP multicasting (obviously).
Paul then mentioned my bridge software as a way to connect LAVC machines
together, even if they are not on the same physical network, which can
be done.
None of this contradicts, or much even relates to your observation that
LAVC works, even on an emulated machine. You just have your simh
instance hooked to a physical ethernet, and LAVC is talking over that
physical ethernet. No IP involved.
Johnny
--
Johnny Billquist || "I'm on a bus
|| on a psychedelic trip
email: [email protected] || Reading murder books
pdp is alive! || tryin' to stay hip" - B. Idol
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