The way cables are organized and distributed is very important.
I have learned that the best way to have minimum affectation when a switch fails is to plug cables between patch panels and switches as follows:
Patch Panel cables organization ---> Horizontal (port 1, port 2, port 2, so on)
Stack Switches ---> Vertical (switch 1 Port 1, Switch 1 Port 2, Switch 2 Port 1, Switch 2 Port 2, so on)
At the end you should have this:
PP 1 Port 1 ---> Switch 1 Port 1
PP 1 Port 2 ---> Switch 1 Port 2
PP 1 Port 3 ---> Switch 2 Port 1
PP 1 Port 4 ---> Switch 2 Port 2
PP 1 Port 5 ---> Switch 3 Port 1
PP 1 Port 6 ---> Switch 3 Port 2