Greg Beeker wrote:
>
> did you try rmdev -dl hdisk0
> This will remove the disk from ODM.
>

Ah, sorry, I did not make this clear. OK, I made

unmirrorvg rootvg hdisk0
reducevg rootvg hdisk0
bosboot -a
bootlist -m normal hdisk1 ...
rmdev -dl hdisk0

Normally, this should leave the disk in defined state but unfortunately
didn't. The machine, when rebooted, recognizes hdisk0 as part of rootvg
what is a failure as the first posting shows.

Patrick