As it says on Details for an installation in linux:
“Checkmk stores its data under the /opt/omd physical path. If the system is to be used exclusively for Checkmk, the major part of the hard drive’s free space should be available. In this case it is not essential – but very desirable – that /opt/omd, or /opt has its own partition.”
Probably it is a noob question, but what advantages having an /opt partition brings?