We have mirroring configured (Transactional replication) in our primary and secondary SQL servers which are running on Win2k8R2SP2 OS with 2008R2SP3 as the SQL version. So if we first upgrade the secondary server, we have to figure out how the synching between the two servers has to be configured as for some time they will be running with two different versions of SQL. We want to upgrade them to SQL server 2014.
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