On 2026/07/30 21:02, Alexander Hall wrote: > On July 14, 2026 11:21:45 AM GMT+02:00, Stuart Henderson > <[email protected]> wrote: > >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. > > > I don't think the intention is to create a new single-disk RAID1.
I know, but if that was possible, you could at least drop a drive, add a new one and copy on the same machine if you have no spare slots. > It sounds more like replacing/rebuilding/"resilver" one underlying disk at a > time onto a larger RAID partition and then let the sr disk grow into them, > giving free space at the end of it. > > I would guess it, at least, boils down to: > > - location of the sr metadata within the underlying RAID partition(s). > > If it is only at the beginning it's probably easier. > > - presence of RAID1 disk size in metadata. > > This might be trickier, but one might be able to force bioctl to > reinitialize a larger RAID1 on top of the former. > > > Anyway, this probably shouldn't be attempted if you are not ready to accept > losing your data. Even if so, I would recommend trying it out on a smaller > scale with some spare drives first. It's not exactly complicated and I think much lower risk than growfs, however, not currently supported by softraid/bioctl.
