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Having again installed OpenBSD on my laptop (it just works), as a reminder my layout of partitions.
This laptop (Thinkpad T430-U) has a 120GB SSD.
mountpoint recommendation from disklabel what I chose in GB ---------------------------------------------------------------------------------------- root(/) 5% of disk. 150M – 1G 2 swap 10% of disk. 80M – 2x max physical memory 8 /tmp 8% of disk. 120M – 4G 5 /var 13% of disk. 80M – 4G + 2x size of crash dump 10 /usr 10% of disk. 1500M – 30G 20 /usr/X11R6 3% of disk. 384M – 1G 0 /usr/local 15% of disk. 1G – 20G 25 /usr/src 2% of disk. 1500M – 3G 0 /usr/obj 4% of disk. 5G – 6G 0 /home 30% of disk. 1G – 300G 45 /home/myuser/local 5 ---------------------------------------------------------------------------------------- Sum 120
Why a special partition for /home/myuser/local? I am used to install self-compiled stuff under my home directory, f.e. current emacs. I don't want to pollute my /usr/local directory. Giving it its own partition below /home gives the possibility to mount it wxallowed.
Disclaimer: I chose to have no seperate partitions for X11R6, src and obj. I just wanted to have one usr partition (except local, because of wxallowed) to be more flexible. Whether this fits your needs, you'll have to evaluate. I won't compile any ports or the kernel at this machine, so I think there is no need for src and obj.
Btw - the logic of auto-partition is explained at [disklabel].