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Azure Microsoft 365

Resolve Your Always On AG Issues: Is It Cluster, AD, DNS, or SQL?

What is causing the Always On AG issue? A Comprehensive Look
Overview
An Always On Availability Group (AG) is a feature in Microsoft SQL Server that allows for high availability and disaster recovery for databases. But what happens when your Always On AG isn’t working as expected? This article dives deep into the possible causes of the issue and how to identify and resolve them.

What is an Always On Availability Group?
An Always On Availability Group (AG) is a collection of databases that are configured to support high availability and disaster recovery. The AG is a feature of Microsoft SQL Server that ensures that databases are always up and running. It also allows for quick failover in the event of an unexpected outage.

What is causing the Always On AG issue?
When an Always On AG isn’t working as expected, it could be due to a number of possible causes. These include:

* Cluster configuration issues
* Active Directory (AD) issues
* DNS issues
* SQL Server issues

How to Identify the Cause of the Issue
In order to identify the cause of the Always On AG issue, it is important to look at the underlying components. This includes the cluster configuration, Active Directory, DNS, and SQL Server.

Cluster Configuration Issues
Cluster configuration issues can cause Always On AG issues. For example, if the cluster nodes are not configured correctly, the AG might not be able to failover or fail back correctly. It is important to ensure that the cluster nodes are configured properly and that the AG is configured to use the correct nodes.

Active Directory Issues
Active Directory (AD) issues can also cause Always On AG issues. It is important to ensure that the AD accounts used to access the AG are properly configured and that the permissions are correct. Additionally, it is important to ensure that the accounts used to access the AG are not locked out.

DNS Issues
DNS issues can also cause Always On AG issues. If the DNS settings are not configured correctly, the AG might not be able to communicate with the other nodes. It is important to ensure that the DNS settings are configured properly and that the AG is using the correct DNS servers.

SQL Server Issues
Finally, SQL Server issues can also cause Always On AG issues. It is important to ensure that the SQL Server instance is configured properly and that the AG is configured correctly. Additionally, it is important to ensure that the SQL Server instance is up to date with the latest patches and updates.

Conclusion
When an Always On AG issue arises, it is important to identify the underlying cause. This article has explored the possible causes of the issue and how to identify and resolve them. By looking at the underlying components such as the cluster configuration, Active Directory, DNS, and SQL Server, it is possible to identify and resolve the issue.
References:
What is causing the Always On AG issue? Is it cluster, AD, DNS, or SQL?
1. Always On Availability Group
2. Always On AG Clusters
3. Always