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Availability Groups and Failover Cluster Instances Expand / Collapse
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Posted Friday, March 21, 2014 3:22 PM
SSChasing Mays

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Hi everyone, I'm reading up on Always on and I am confused what is the difference between AlwaysOn Availability Groups and AlwaysOn Failover Cluster Instances. Can you shed some light on this? Thanks.


Post #1553684
Posted Friday, March 21, 2014 4:07 PM


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Availability Groups are a mechanism for setting up the ability to fail a database or a set of databases from one server to another. With this setup, there is nothing shared between the servers. They each have their own disks, their own CPU, etc. A cluster is at the server level. In a cluster, there is a shared disk between the two (or more) machines that each has to have access to in order for the service to work. You can get a lot more detail if you go and read the entries in the Books Online at MSDN.

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Post #1553697
Posted Friday, March 21, 2014 5:56 PM


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shahgols (3/21/2014)
Hi everyone, I'm reading up on Always on and I am confused what is the difference between AlwaysOn Availability Groups and AlwaysOn Failover Cluster Instances. Can you shed some light on this? Thanks.

Check my articles on this site here and here and here. Parts 3 and 4 will be published soon.
Post back if you still have questions


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Post #1553715
Posted Monday, March 24, 2014 10:31 AM
SSChasing Mays

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Thank you!


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