Answers to my own questions, for record purposes.
W dniu 18.12.2024 o 18:26, Radoslaw Skorupka pisze:
Good news: I'll be installing new z16 machines. :-)
There is no longer physical HMC!
Physically we have two x86 "pizza box" machines inside CPC cabinet,
one is primary SE, the second is Secondary SE. And HMC as an virtual
machine. To be precise HMC is an application working on machine's OS,
while SE runs in guest machine.
What about LAN ports?
Q1. Connectivity between SE and HMC. Is it physical connection or some
emulated internal LAN, more or less like Hipersockets?
No. You have to physically connect SE and HMC, despite it is single PC
server.
Q2. How to know what physical LAN port belongs to SE or HMC?
It is documented in (quite new) SC28-7045. There are six Eth ports close
to each other. See the picture, because there are more UTP ports. Link3
and Link4 belong to SE, Link5 and Link6 belong to HMC. Actually the
purpose of the ports did not changed when compared to physical HMC & SE.
Q3. How to connect SEs from two machines to create single logical
network (both CPCs can be managed from single HMC)?
Actually the purpose of the ports did not changed when compared to
physical HMC & SE.
My personal opinions:
1. It is good to have two HMCs in single CPC. Especially for shops with
one CPC, there is redundancy for HMC.
2. It is (and it was) bad the HMC does not utilize third Eth port. Two
ports in SE allow to use two redundant, independent networks to connect
between other SEs and HMCs. However one Eth port in HMC should be used
for outbound network connectivity and the SE-HMC network/networks should
remain isolated from outbound network. It is no cost, just another port
or "hipersocket" virtual LAN.
(side note)
In the past direct connectivity to SE was required for "Load from DVD of
FTP Server". It was really tricky since the icon/task was present on
HMC, but the connection was being established from SE to ftp. However it
was fixed many moons ago and now HMC works as a proxy.
--
Radoslaw Skorupka
Lodz, Poland
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