>So now - more of a "yum" question - what can I put in some file to prevent yum from trying to upgrade drbd8 to drbd82 for now?

Edit your /etc/yum.conf and add the following:
exclude=drbd* kmod-drbd*

Thanks.
I suppose that tells "yum" to avoid upgrading drbd at all. I can probably do:
exclude=drbd82* kmod-drbd82*
to avoide the drbd82 packages.

Can I tell yum to ignore "drbd" packages from the extras repository only, so it'll keep updating drbd 8.0 for security fixes?

Cheers,

--Amos