I have an application for which I want to set up a master/slave mysql database, because the current db struggles under high load.
I have two different servers for db replication. Lets call them A and B. A is the current db server.
Let's score the CPU power of A as 10 and B as 7. B has half the memory of A. Both servers run on SSD.
The read/write ratio is about 9 to 1.
Now, my question is which server should be master? and why?