Ccminer is very unstable with 19 gpu's ..
I just wander why would anyone create system like that and get a constant problems. Comparing to total system cost, an extra motherboard+cpu+memory would not be that big investment, but release complexity by times.
Well ...
Following the strict rules that are required to run such a machine, there really isn't much issues, let alone problems.
Once a design is set, it is very easy to duplicate. That is the reason you would go that route. Density plays a massive part if you are doing this on a larger scale.
That is why, at least for CWI.
#crysx
Maybe the price of adding the extra mb/cpu/ram/ssd needs to be spelled out, thats like an extra $400-500. Fit as many GPU's as you can for the farms.
Perhaps in terms of initial costs but maybe not in terms of availabilty management (maintenance costs).
If you split your single 19 gpu rig into multiple smaller rigs (let's say 3 rigs), you will probably remove many annoying factors. For example, you will probably remove PSU coupling, ease thermal dissipation, etc.
You will probably have less stress with complete downtime; 2 rigs still working while one is on fault/repair.
As stated by crysx, the only valuable reason to build huge rigs is "limited" space
Space and power availability.
Two of the main reasons people go this route.
We are 'prototyping' a number of these motherboards filled with these cards and we are looking at the maintenance side very closely. As you mentioned, the bigger you grow in the singular unit, the more headaches you open yourself up to. However, the flipside of that also, is that once you have a tried and tested system in place (which we now do), the maintenance time is reduced to such a small factor, that it is more of an issue to go the smaller GPU/More MotherBoard way. We are finding that out literally as we chat about it.
Hence why we have also purchased another 7 x 19GPU motherboards, and our 'standard' way of building them, which are a lot easier to maintain. One only needs a system in place and a method maintenance, and it becomes easy. When all these 7 MotherBoards are populated, we will let you know what 'other' headaches may arise. So far - the first two are not only doing well, but running like wildfire. BTW - only 16 GPU's are in each due to the nVidia driver limitation. Duplicated Linux and you are running in an hour including the physical build.
The first build/prototype took a full weekend. So a little over an hour from unboxing to full build and mining is a massive achievement in comparison to a full weekend.
#crysx