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We recently upgraded our six-node cluster from Server 2022 to Server 2025. We upgraded manually, but ran into issues where once the new 2025 node was added back into the cluster, we could only live migrate VM roles between the server 2025 nodes. We used the same drivers packs, but when looking at the processors within the device manager the drivers were different. Is there any known compatibility issues you all are aware of?
MicrosoftI'm not aware of any compatibility issues - the Cluster OS Rolling Upgrade process should have worked, and the VMs should have been able to live migrate between the different OS versions of the cluster nodes. We recently updated the documentation: Upgrade the OS of a Windows Server failover cluster by performing a cluster OS rolling upgrade | Microsoft Learn. Also, I should ask, did you consider opening a support ticket for this issue?
Thanks for the reply, Rob. We did not open a case. This is a cluster in our test environment. We just pushed through upgrading all of the nodes as quickly as possible.