What challenges were encountered during the creation of the Always On high availability cluster?

When creating a high-availability Always On cluster, the following challenges often arise:

• Network delays and fault tolerance: it is necessary to ensure a stable and fast connection between nodes, otherwise frequent role switching may occur.
• Data consistency: with synchronous replication, it is important to avoid data discrepancies between the primary and secondary nodes.
• Automatic failover configuration: proper setup so that in case of primary node failure, the system quickly and seamlessly switches to the secondary.
• Monitoring and alerting: a monitoring system should be configured to respond promptly to issues.
• SQL Server compatibility and versions: all nodes must be compatible in terms of versions and patches.
• Resource planning: the cluster requires additional resources, which should be considered during infrastructure design.

Example: when configuring Always On Availability Groups, it is important to correctly configure the Listener so that clients can automatically connect to the active node without manual intervention.