BwUniCluster2.0/Maintenance/2020-10

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The following changes are planned for the maintenance interval starting on 06.10.2020 (Tuesday) and ending on 13.10.2020 (Tuesday).

1 Operating system

  • The operation system Red Hat Enterprise Linux (RHEL) 7.7 will be upgraded to RHEL 8.2.
  • The kernel version will be upgraded from 3.10 to 4.18.
  • The Mellanox OFED InfiniBand Stack will be upgraded from version 4.7 to 4.9. If you maintain your own MPI libraries (e.g. official or patched versions of OpenMPI, MVAPICH etc. compiled in your $HOME directory), we recommend to re-compile these libraries after the upgrade.

2 Compilers and Libaries

  • The GNU C Library (glibc) will be upgraded from version 2.17 to
  • The default system compiler will be upgraded from GCC version 4.8.5 to 8.3.1.

3 Userspace tools

  • The screen utility is no longer supported by Red Hat. The recommended replacement is tmux.
  • The default version of the Git version control utility will be 2.18.

4 Batch system

  • The maximum number of jobs a single user in all queues will be reduced to 100 (from 200).

5 Graphics stack

  • The K Desktop Environment (KDE) is no longer supported by Red Hat. start_vnc_desktop will default to GNOME after the upgrade.
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