What I did was edit the lvm-common entry in /etc/cron.d and remarked out the line that starts with a " ! " following the " ! " is the line you are seeing as the subject of the mail.

You could probably just remove (delete) the lvm-common file, but I would rather just comment something like this out, in case something comes up later and you find out now you need it. I would rather error on the safe side.

HTH

rock