A. With Windows Server 2008 and above, you can configure each of the various settings related to latency of heartbeat responses and number of missed messages before a location is considered unavailable. The key values you want to tune would be:
- SameSubnetDelay—Frequency heartbeats are sent. Default is one second.
- SameSubnetThreshold—Missed heartbeats before an interface is considered down. Default is five heartbeats.
- CrossSubnetDelay—Frequency heartbeats are sent to nodes on dissimilar subnets. Default is one second.
- CrossSubnetThreshold—Missed heartbeats before an interface is considered down to nodes on dissimilar subnets. Default is five heartbeats.
You can configure these with the cluster.exe command line interface and the Set-Cluster PowerShell cmdlet.Related Reading:
- Q. How do multi-site clusters work with Windows Server 2008?
- Windows Server 2008 Failover Clustering
- Q. How can I create a new Windows Server 2008 cluster resource group from the command line?
- Windows Server 2008 Changes Simplify SQL Server Clustering
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