How to optimally configure a disk system?

Question

linux

HELO
There are:

• Workstation on Debian 8.
  
• 200 GB Intel SSD.
  
• Two HDD Maxtor 4TB each, which will be combined into RAID1.
  
• RAM 32GB.
  

You need to configure partitions from the following requirements:

• The /home section must be on the raid.
  
• The machine will run many processes with several GB of RAM each. Not always at the same time, often in turn, in an unpredictable order.
  

Questions:

1. Make root partition on SSD?
   
2. Use SSD as LVM Cache and/or swap?
   
3. Implement paragraphs. 1 and 2 at the same time? In what proportion?
   

Considerations:

• Since there will be many heavy applications, the swap is still needed.
  
• Swap is good on SSD.
  
• It makes sense to do LVM Cache only for data that is not on the SSD.
  
• The more cache, the better.
  
• Swap cache is weird.
  
• Making a root on a RAID is somehow sykotno, maybe unreasonable.