Before you start you should familiarize yourself with the ARCS setup and how to run programs from the Command monitor prompt. If you're installing OpenBSD/sgi for the first time it's a very good idea to look at the partition sizes of disk you intend installing OpenBSD on. Changing the size of partitions after you've installed is difficult. If you do not have a spare bootable disk, it may be simpler to re-install OpenBSD again from scratch. Assuming a classic partition scheme with root (`/') and /usr filesystems, a comfortable size for the OpenBSD root filesystem partition (a) is about 64Mb. The install will take ~30Mb of that. However it has shown that 256M is not a bad choice when more packages are to be installed. A good initial size for the swap (b) partition is twice the amount of physical memory in your machine or at least 128M. A minimum /usr partition (e) is ~256M but with that you will likely run into trouble later. A minimum size of 1G is recommended. A full binary installation, without X11 or any other additional software, takes about 170M in `/usr'.