/ - 100MB
swap - 1GB
/tmp - 500MB
/var - 500MB
/usr - 3GB
/home - 500MB
At the beginning of installation of system, I managed to use the whole hard disk for OpenBSD. I partitioned the hard disk, but after I quited the partitioning section, there was always an error:

I wonder why would this happen? I haven't put anything in the directory! Or it is my / directory too small? Anyway, I tried again and make / directory to 3GB large. Now the installation went smoothly.
However, the same error appeared when I have configured the network settings.

OMG, could someone point out my mistakes? Compared to Linux (I use Debian on my server), the installation of BSD is much difficult to me. I also want to know how large should the / directory be?
Really thanks for any input/ suggestions!
