Absolute Openbsd Unix For The Practical Paranoid [Electronic resources]

Partitioning"). This would allow you to "upgrade" part of your system to OpenBSD, which is especially useful on multiple-boot systems. To do this, just download the parts you need from the release directory on a FTP server. If you're not sure which parts you need, you can safely download the entire release directory for your architecture — it'll take up a little more room, but will ensure you have everything you might need.

Finally, you can download the files you need and make your own local OpenBSD install server.

Local Installation Servers

One reason ISOs are popular is that you can reuse them to install many machines at the cost of a single download. If you want to install a few (or many!) OpenBSD machines without buying a CD-ROM, and yet without using up bandwidth for each install, just download the entire release directory for your architecture. If you copy these files to a local FTP or HTTP [Distribution Sets").

[1]Some architectures also support installs over NFS, but not all of them, so we won't cover it here.