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Cluster on SQL Server 2008 R2


Cluster on SQL Server 2008 R2

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Jitendra Padhiyar
Jitendra Padhiyar
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Hello Masters,

I have clusters on sql server 2008R2, I am learner for clustering on sql. So can you pls guide me regarding cluster on sql server 2008? I can see on one node sql services are up and running and on another server is stopped ? Why so? I heard its active-active clustering, If its active active than sql services should be up on both the servers correct?

Let me correct if I m wrong..

Thnx in advacne,
Jitendra
anthony.green
anthony.green
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First off, it is best to get the terms active active, active passive out of the mind set, while these are valid terms they are not nessesarily correct when looking at a cluster.

First off how many instances of SQL server are installed on the cluster? If 1 instance then you will always have 1 node not running, if multiple instances then depending where the instances are currently running from you could have 1 box running all the instances and the other will be stopped, or you could have instances running on all the nodes.



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Perry Whittle
Perry Whittle
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jitendra.padhiyar (1/4/2013)
Hello Masters,

I have clusters on sql server 2008R2, I am learner for clustering on sql. So can you pls guide me regarding cluster on sql server 2008? I can see on one node sql services are up and running and on another server is stopped ? Why so?

For each clustered instance installed that is correct. The active node will have the services started. Since the partner nodes will not be holding any resources the services cannot be started.

jitendra.padhiyar (1/4/2013)
I heard its active-active clustering, If its active active than sql services should be up on both the servers correct?

So you have more than 1 instance installed and running on multiple nodes?

Don't get confused with Oracle RAC that is not what failover clusters provide

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"Ya can't make an omelette without breaking just a few eggs" ;-)
Rama Chandra Gowtham. Peddada
Rama Chandra Gowtham. Peddada
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In Active Passive clustering, Instance1 would be active on node1 and on node2 SQl Services will be in stopped state. When ever a failover happens the SQl resource group will failover to the other node node2 in the cluster.

In Active Active clustering both the nodes node1 and node2 act as primary servers but for different instances. consider below example for better understanding.


Instance1 will be active on Node1 and on node2 the SQL server services of instance1 will be in stopped state.

instance2 will be acvtive on Node2 and on node1 the SQl server services of instance2 will be in stopped state.

Thus on both nodes N1 and N2 we have SQL Server services, but at a given point only 1 node will be primary. Since both the nodes N1 and N2 will host as primary for 2 different instances this concept is called Active - Active clustering



Hope this clarifies the confusion.Let me know if you need more details.
Jitendra Padhiyar
Jitendra Padhiyar
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Thanks Anthony, Penny and Rama.

@Penny: there are two instances.

I think i got the lesson that I am working on Failover cluster where sql services are stopped on one server and its up and working on another. Morover, I am able to access sql server from both the nodes using Virtual cluster name.


Thanks again and let me know if you have more information.
Perry Whittle
Perry Whittle
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jitendra.padhiyar (1/8/2013)
@Penny

That's ok mitundra ;-)

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