Well running with /usr read-only is not supported but it only takes a mount -uw from times to times so it's worth it in my opinion.
If running OpenBSD on multiple partitions is ok with /etc/boot.conf then why not ? I don't see any caveat except choosing the right partition at install and upgrade. At worst you end up with the wrong version of OpenBSD and need to reinstall with separate /home it's no problem. Be careful with bsd.rd and it should work. I have a few machines with multiple disks that could be mounted as root but only installboot and /etc/fstab decide what to mount as root as far as I have seen in OpenBSD world. On Wed, Sep 17, 2025 at 1:34 AM Stuart Henderson <[email protected]> wrote: > > On 2025-09-16, Crystal Kolipe <[email protected]> wrote: > > On Tue, Sep 16, 2025 at 03:43:32PM +0000, Roderick wrote: > >> I want to have two versions of OpenBSD in the same disc, and reinstall > >> / update one of the two as I feel necessary. > >> > >> Is it possible? > > > > It's _possible_, but it's one of those things that can easily go wrong if > > you > > are not 100% sure of what you're doing. > > This includes at upgrade time, not just install time. > > Right now in particular, I would defer doing anything tricky with > partitions until some things land in the tree. > > > If you need to ask, it's very likely > > that don't have enough OpenBSD experience to avoid difficulties further on. > > as is often the case when doing things where there's no clear path in > the documentation. > > -- > Please keep replies on the mailing list. > -- Thomas de Grivel https://www.kmx.io
