geom_mirror silently upgrading metadata

[Dag-Erling Smørgrav]

Pawel Jakub Dawidek <pjd at FreeBSD.org> writes:
> ZFS does exactly 3. What you are suggesting could be done by not loading
> geom_mirror.ko module and mounting file system read-only from one of the
> mirror components.  [...]

Would it really be that hard for geom_mirror to translate enough of the
old metadata to access the mirror r/o, and only perform the upgrade on
explicit request?

DES
-- 
Dag-Erling Smørgrav - des at des.no