vinum to gvinum help

[Sven Willenberger]

I have an i386 system currently running 5.2.1-RELEASE with a vinum
mirror array (2 drives comprising /usr ). I want to upgrade this to
5.5-RELEASE which, if I understand correctly, no longer supports vinum
arrays. Would simply chaning /boot/loader.conf to read gvinum_load
instead of vinum_load work or would the geom layer prevent this from
working properly? If not, is there a recommended way of upgrading a
vinum array to a gvinum or gmirror array?

Thanks,

Sven