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SQL Server clustering : Resource Sharing

Posted on 2012-04-02
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Last Modified: 2012-04-10
Hi,
1. What is shared nothing architecture under SQL server clustering?
2. Is each database at node replicated on other node fro failover?
3. If I have 4  nodes in a cluster, can I distribute the load for those databases across all nodes of the cluster? Under ORACLE RAC it works brilliantly. I read in docs I can't?
4. If that is the case then how does having more than 2 nodes in a cluster helps?


Thanks
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Question by:crazywolf2010
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irweazelwallis earned 2000 total points
ID: 37795898
you can't do this out of the box with SQL - at least automatically

If you set up a cluster the DB's sit on shared storage and that storage is failed over to a specific node
If you have mutiple nodes and multiple instances in the cluster then you can distribute the load among them by moving specific instances to each node i.e DB1 on instance 1 on SQL1 and DB2 on instance 2 on SQL2 -

be aware that this changes the licencing you need as it is no longer active-passive/failover clustering so you will need to licence each server.

By having a 2 or more node SQL cluster means you have automated resilience so that if one node has a hardware failure then databases and instances will fail over to the other node, you could have this multisite to give you geographical resilience as well
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