This is the 2nd time this has happened to me. There was a kernel release over the weekend to .67.0.15, yet, they did not release the updated GFS to go along with it, so when the machine rebooted, there was no gfs file system in the new running kernel which in turn wreaked havoc on my cluster. I truly wish they would not do that :). I guess I shall have to not allow automatic yum updates from these machines.