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Two complexes, AB and AD, have already been through the update, as well as the GPU partition on AC. The last and 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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Once the tests are done, please restore your target host to the original value.Please be aware that the small GPU partition in complex AC has already been upgraded to rhel 8.8.
You may get in touch with us for any concerns of doubts by raising an issue through our ECMWF Support Portal.