Migration of AlwaysON database from WSFC 2008 + SQL2012 to WSFC 2012 + SQL2014

Hello All,
I have a 6 node GEO cluster, 4 nodes in primary site + 2 nodes in secondary site. In the primary node 03 and 04 has 2 pair of SQL instances default + named.
I am planning to move the named SQL pair from WSFC 2008 + SQL2012 TO WSFC 2012 + SQL2014. It has only one AG group with 4 TB of DBs.
Do you guys have any experience and options for this migration. I am planning to go with backup/restore. Let me share yours inputs.
1. Backup/restore 2. cross cluster migration 3.Detach/attach 4. SAN migration
Thanks!
Muthukkumaran Kaliyamoorthy
Helping SQL DBAs and Developers >>> SqlserverBlogForum

Since WSFC does not support rolling upgrades, you will need to have another WSFC running Windows Server 2012/R2 (R2 is highly recommended due to the features available for maintaining high availability) and do a cross-cluster migration. Refer to this documentation
for more details.
https://msdn.microsoft.com/en-us/library/jj873730.aspx
This requires that you're fairly comfortable with PowerShell.
The main challenge here is dealing with hardware resources since you will need additional servers when moving into the new WSFC. You would have to run multiple instances on the same cluster node while you remove a node and repurpose it for WSFC 2012/R2.
This is where proper planning is very important to make sure you are maximizing your resources while minimizing downtime. I cannot speak about the capabilities of your SAN as each vendor will have different features but my approach has always been dependent
on SLAs and recovery objectives. Backup/restore will still be needed to synchronize your data from the old WSFC to the target WSFC.
Edwin Sarmiento SQL Server MVP | Microsoft Certified Master
Blog |
Twitter | LinkedIn
SQL Server High Availability and Disaster Recover Deep Dive Course

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