We upgraded to RHEL 6.8 for both Oakley and Ruby clusters during the October 12th's downtime. Unfortunately, we are noticing some NFS problem that has been causing rsh, or ssh sessions to hang on Oakley and Ruby. To resolve this issue, we've downgraded the kernel version to one that is not exhibiting the NFS regression, and started to reboot compute nodes on Oakley and Ruby. It won't affect any running jobs, but users may experience longer queue wait time on Oakley and Ruby.
In addition, it is scheduled to reboot the two login nodes of Oakley cluster, as well as ruby02 login node between 9:00-9:30 am tomorrow Oct 18, 2016, as a part of the downgrade procedure. Both Oakley login nodes and ruby02 will not be accessible during that time.
We really apologize for any inconvenience this may cause you. Please contact firstname.lastname@example.org if you have any questions.