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The default is 20 minutes, plus the 10 minutes it takes for the cluster to even change the record, plus the amount of time a client caches the record. This can lead to long fail-over times.
To change the TTL to 5 minutes run: Cluster.exe res
Thursday, September 17, 2009
Windows 2008, Exchange 2007 CCR Cluster multi-subnet
To decrease the fail-over time of a multi-subnet CCR cluster running Exchange 2007, decrease the TTL of the DNS record. When a fail-over occurs in a multi-subnet environment, the DNS record must change to the new IP. To make this happen faster, run the below command.
The default is 20 minutes, plus the 10 minutes it takes for the cluster to even change the record, plus the amount of time a client caches the record. This can lead to long fail-over times.
To change the TTL to 5 minutes run: Cluster.exe res /priv HostRecordTTL=300
The default is 20 minutes, plus the 10 minutes it takes for the cluster to even change the record, plus the amount of time a client caches the record. This can lead to long fail-over times.
To change the TTL to 5 minutes run: Cluster.exe res
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