Running Different Versions of drbd / kmod-drbd on different nodes

If a cluster has 4 data nodes, and they are deployed in such a way that Nodes 1 & 2 replicate only to each other, and Nodes 3 & 4 replicate only to each other, is it okay to run Nodes 1 & 2 on a different version of drbd and kmod-drbd than nodes 3 & 4?

-Eric



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