- how do you cope with video surveillance, large media disk, asterisk, large SQL database, ... ?
I have probably more media than most people and have no problems with the sql database size at all. My media lives on a NAS, however I know one person simply uses a large drive plugged in USB3 on the odroid. None of us have any video surveillance at the moment so I couldn't comment on that.
- do you have also MDs on cores (I'm quite happy with simpler MD on core - using UI1 on main touchscreen) ?
I do not run an MD on the core, and I don't think any of us are at the moment. It might be possible but we are running the odroids as 'core only' devices.
- I guess you use RPis v2 for MDs - are they full blown MDs? Can you start media on them from Orbiters ? Is RS232 TV control supported ?
I have a mix, follow the link in my sig to see what I'm running. The rpi2's are full blown MDs (UI1 only). They act like any other MD and you can control them from any orbiter in the house just like any other MD. RS232 control is fully supported. I have rs232 control of one of my TVs, CEC control of another and UIRT control of another. The big difference is that the arm device is much too slow for PXE style booting. All of my MDs are 'disked' MDs (rpis from their SD cards and the zotac from a small SSD). And I lie there, I have a single old RPI1 doing audio (squeeze) only that is PXE booting from the odroid, the others were just too slow in PXE config.
One idea is to divide system and have video surveillance on separate system (one of chinese good products) and lessen the burden on those cores...
I know nothing of this, however I figure there must be a way to move the video stuff to a secondary low power device and have lmce interface with it. Again, I know nothing of how this is currently implemented in lmce so I'm speculating here.
I hope that helps you out a bit, check my sig and see what I've got setup. And check gitlab out for specific issues/bugs that are known.