Just what is the solution

Question

Apologies in advance for my lack of understanding in this area, I have read a fair amount but cleary not everything I need as I am still confused.
The landscape is something like this
8 ECC6 systems for mainly HR work
8 SRM 4 systems
8 PI systems (dual)
8 EP systems
8 CRM ECC systems
8 CRM EP systems
8 CRM systems
4 PI system (hopefully 6 soon)
2 Solman
2 CCMS
2 NWDI
The 8 systems consist of
Dev,QA, pre prod and prod as a maintenance track 
Dev and QA systems for project
2 training systems
I want to set up my solution(s) to suit both Oerations and Project IMG.
I have read advice from people and they tend to fall into the following conflicting areas
1. You should not have more than 10 sysytems in a solution due to performance
2. You should have your solution across your components for project work
3.  You should have each component in its own solution for operations
Can someone please advise me of the correct solution(s) for my solution manager.

Answer 1

Hi Graham,
I have seen solutions with 100 systems in it. However, performance can be an issue with such big solutions. You should first of all put each tuple of 8 systems into one logical component. You will have 11 logical components at last. Now you must decide if you want to have monitoring and EWA for all systems or just for productive systems. If you need this only for productive systems, then create one solution with all logical components. Monitoring will be done only for production systems by default which is 11 systems. In this solution you can also setup Business Process Monitoring which you will do only in productive systems. This solution will have a very good performance and you will have all systems available still for your work in the process structure. If you need to monitor them all I would suggest to create additonally to the first solution which contains your proceses one solution for monitoring and EWA per product family and activate all systems with right clicking in the grid in the system landscape maintenance screen. For solman CCMS and NWDI I would define one solution.
Regards
Andreas