For more details on this, hop on to the blog post that I provided in the beginning of this blog post. Wrap up the entire process in a day or two and be done with it. This is only to perform rolling upgrades to make your systems really highly available. Microsoft might not support if you stay in mixed mode for more than 4 weeks. Note: You don’t want to run in mixed mode of WSFC for long periods. Let’s go, I added the new Win2019 nodes to the existing windows failover cluster which is running on 2012 R2 functionality level. To begin with I have two brand new SQL Server 2019 standalone Instances(W16SQL2019A and W16SQL2019B), on which I just enabled HADR feature. Now, let’s see this in action one step at a time.īelow is the screenshot of all my SQL Instances which I will be working on. Evict both windows 2012R2 nodes from the cluster and raise the functionality level to 2016.During the final cutover date/time, failover to SQL 2019 and remove the old replicas from AG.Join the databases and let the magic happen.Install SQL 2019 and add these two nodes as replicas at SQL Server AOAG layer.Add W16SQL2019A and W16SQL2019B nodes to the same windows cluster leveraging mixed mode.To upgrade these SQL Instances to 2019 running on windows server 2016 with a very minimal downtime and no configuration changes for the App teams, assuming In-place upgrades are not allowed. Anyways…the bottom line is I have SQL 2014 AG running on Win 2012R2 which needs to be upgraded/migrated to SQL 2019 running on Windows 2016. I didn’t want to change the host names as I had my windows Fail over cluster all setup by this time and I really don’t want to deal with fixing any annoying errors that might popup because of messing up my host names of my nodes. Originally I thought of Installing SQL 2016(hence the host names), but ended up installing SQL 2014 for now based on our specific requirement. These replicas are running on the latest build of SQL 2014 as of the date this post is published.Īs you can see, W12SQL2016A/B are my two replicas(Nodes) which are running Win2012R2+SQL 2014. I have a listener configured for my applications to connect. I’ve a two node Failover cluster (Windows Server 2012 R2) hosting SQL Serevr 2014 Always On Availability Group with synchronous commit mode. So let me briefly explain what we are trying to achieve here. In this blog post I will be sharing something similar but throwing SQL Server availability groups into the mix. Aim:To upgrade/migrate (side-side) SQL Server 2014 Availability group(s) running on Windows Server 2012 R2 to SQL Server 2019 running on Win 2016 with the least amount of downtime.Ĭouple of years ago, I wrote a blog post explaining how to upgrade Windows OS from 2012 R2 to 2016 on nodes participating in fail over clustering with minimal downtime using rolling upgrade technique.
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