Hi,
Based on my understanding, you would like to migrate Server 2008R2 SQL cluster to Server 2016 Cluster, then configure Server 2016 SQL cluster to be multi-site Cluster for DR.
If so, I would suggest you first follow the steps below to migrate Server 2008R2 SQL cluster to Server 2016 Cluster:
You may check scenario 2 in the below link:
And if you would like to use the same SAN storage for the new Cluster, we can just point the Storage to the Server 2016 cluster after migration.
After migrating to the Server 2016 Cluster, we may follow the steps below to deploy multi-site SQL cluster:
Thanks for your time!
Best Regards,
Anne
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