I understand that this question has been posted here before and If someone could send me those discussion threads that would be great !!

Yep, just went through it in depth a few months ago:

http://teaparty.mathworks.com/toasters/9583.html

Basic consensus from my perspective was "if you can justify the disks to do it, go for it, otherwise there's no huge loss." Having a separate rool vol will of course be needed for volcopy/snapmirror/etc.

..kg..