In the process of migrating from a C200 to a C220 M5. The plan is to migrate to the new hardware and then upgrade to 11.5 SU5. I know I can restore the entire cluster and then do the normal upgrade process on the cluster and migrate the phones to the new servers. Question was, is there any issue building a 9.1 publisher on the new hardware, restoring the DRS backup to that server, performing the upgrade on that new publisher and switching versions, and then doing fresh installs of the subscribers to 11.5 SU5?
