Mystery solved:
There are numerous hosts under one master in the pool. I ran the yum update command on the master first, then rebooted, I then ran yum update on the rest and rebooted all but one. I could not reboot the last one until this morning (Saturday).
I rebooted the last one a few minutes ago and all is well.
Because I think its interesting, I'd love someone smart to explain the process of why other hosts could not do a snapshot because a different host in the pool had not been rebooted.
