In our case our replication factor is more than half the number of nodes in
the cluster.

Would it be possible to do the following:

   - Upgrade half of them
   - Change Thrift Port and inter-server port (is this the storage_port?)
   - Start them up
   - Upgrade clients one by one
   - Upgrade the the rest of the servers

Or might we get some kind of data collision when still writing to the old
cluster as the new storage is being used?

/Daniel

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