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Two complexes, AB and AD, have already been through the update, and the last complex AA will follow is expected to be upgraded last to 8.8, about a few days week after AC.
The update itself should be completely harmless and transparent in most cases, except for those using the vendor provided OpenMPI, typically loaded via module load openmpi. On the updated OS image the default version of vendor-provided, vendor-supported OpenMPI changes from 4.1.1.1 to 4.1.5.4.
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