https://www.pachadata.com/en/tags/wsfc/Recent content in WSFC on Rudi BruchezHugoenFri, 28 Aug 2026 16:31:38 +0200https://www.pachadata.com/en/docs/howtos/hadr/failovers/Tue, 27 Jan 2026 00:00:00 +0000https://www.pachadata.com/en/docs/howtos/hadr/failovers/<div class="alert alert-success" role="alert"><div class="h4 alert-heading" role="heading">TL;DR</div> <p>To avoid spurious failovers in an Always On environment, adjust these settings:</p> <ul> <li><strong>Lease Timeout</strong>: raise it if your server goes through CPU load spikes.</li> <li><strong>HealthCheck Timeout</strong>: raise it if your server is slow to answer diagnostic requests.</li> </ul> </div> <p>When you run AlwaysOn Availability Groups, it is not unusual to get spurious failovers while your system is working perfectly well.</p> <p>It tends to happen at night, and more rarely during the day. The most common cause is a temporary unavailability of the system, which makes the cluster health checks time out. A typical example is a VM freeze while backup software takes a snapshot.</p>