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This topic limits the discussion to the upgrade of SQL Server itself.It does not cover upgrading the operating system containing the Windows Server Failover Clusting (WSFC) cluster.To prevent data loss, change the commit mode to synchronous commit and wait for the secondary replica to be synchronized before you fail over the availability group.Therefore, the rolling upgrade process may look as follows: If an availability group contains failover cluster instance (FCI) nodes, you should upgrade the inactive nodes before you upgrade the active nodes.But in the simplest scenario, a rolling upgrade is a multi-stage process that in its simplest form involves the following steps: If you have deployed an availability group only for disaster recovery, you may need to fail over the availability group to an asynchronous-commit secondary replica.Such configuration is illustrated by the following figure: In this situation, you must fail over the availability group to the asynchronous-commit secondary replica during the rolling upgrade.THIS TOPIC APPLIES TO: SQL Server (starting with 2016)Azure SQL Database Azure SQL Data Warehouse Parallel Data Warehouse When upgrading a SQL Server Always On Availability Group to a new SQL Server 2017 version, to a new SQL Serverservice pack or cumulative update, or when installing to a new Windows service pack or cumulative update, you can reduce downtime for the primary replica to only a single manual failover by performing a rolling upgrade (or two manual failovers if failing back to the original primary).During the upgrade process, a secondary replica will not be available for failover or for read-only operations, and, after the upgrade, it may take some time for the secondary replica to catch up with the primary replica node depending upon the volume of activity on the primary replica node (so expect high network traffic).

When trying to manually Live Migrate this VM I was prompted to override the locked resources and try again…Upgrading the Windows operating system hosting the failover cluster is not supported for operating systems before Windows Server 2012 R2.To upgrade a cluster node running on Windows Server 2012 R2, see Cluster Operating System Rolling Upgrade In practice, the exact process will depend on factors such as the deployment topology of your availability groups and the commit mode of each replica.I thought there was a conclusionary chapter to this story, but there isn't.When/if it does ever get written I'll be sure to add it! : Continued from Chapter 5 and 6 of this story through this link here. Carrington's eyes opened softly into the morning light.

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