On 2021-02-13, Joseph Mayer wrote:
> https://www.openbsd.org/faq/faq14.html#softraidFDE says:
>
> "Note that "stacking" softraid modes (mirrored drives and encryption, for
> example) is not supported at this time."
>
> I had the impression that it's possible. Please feel free to
> doubleconfirm this one.
it may be "possible" but, if you like your data, it's probably better
to go for something which is "supported".
> Here https://marc.info/?l=openbsd-miscm=144899721527642w=2 is a
> previous mentioning in the mailing list of "sandwhiching" softraid
> from 2015, there was no correction of the question then.
if you don't need to boot from it, see the recently added RAID1C
discipline in -current (combined RAID1+crypto).