For some reason one physical server and two virtual servers would not boot after the new kernel was installed.  Something went wrong during the install process and messed up the grub configuration on two of the machines, I was able to repair these with the boot-repair disk from sourceforge.  But a third machine was so scribbled I had to restore it from backups.

     At this point everything is back in service.  I apologize for the longer than anticipated outage.