fix remote degraded gmirror

[Robin Becker]

Thanks for the information re reboot; I think I knew it was a sata already. My 
one remaining question is what preparation does the hd need prior to gmirror 
insert. I see various people recommending clearing out various chunks of the 
disk (to make the disk unambiguously not in sync?), but that doesn't seem to be 
required. I guess the whole idea is to be able to just connect a new disk and 
start the system up and then insert back into the mirror.
-- 
Robin Becker