On 2026-07-13, Chris Ross <[email protected]> wrote: > So, I have a failed disk in a softraid mirror. While looking to replace it, > I want to just replace both drives and get a larger fs. > Most of my experience in recent years has been using ZFS, so I know how to > do exactly this with ZFS. But, I can’t find a general guide or anything > specific in the docs/pages for bioctl, that describes how to do this with > OpenBSD. > > Is there a way to replace a failed drive with a larger one, rebuild the > mirror onto it, then replace the smaller remaining drive with one of equal > size and rebuild onto that? Then, a step would need to be performed to tell > the softraid device to fill the new available space, and then growfs. > > Thanks. Sorry if it is already documented somewhere and I failed to find > it in my quick search.
Not supported with softraid. You can't create a "1-disk RAID1" and add the second drive later either. Unless you want to get dirty with poking at low level data structures, you'll either need to have both new drives and the remaining working old drive connected at the same time and dump/restore, or dump to external media + swap drives + restore, etc. -- Please keep replies on the mailing list.
