Wednesday, August 6, 2014

Looks Alive Vs Is Alive

Looks Alive 

check:Looks alive check is a basic resource health check to verify that the service(SQL service in our context) is running properly. To perform this , cluster service queries the windows service control manager to check the status of the service. By default looks alive check will happen in every five seconds.

Is Alive check: 

An exhaustive check to verify that a resource is running properly. If this check fails, the resource is moved offline and the failover process is triggered. During the Is alive check the cluster service connects to the SQL server instance and execute select @@SERVERNAME. It will check only the SQL server instance availability and does not check the availability of user databases.

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