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Availability Groups and Failover Cluster Instances


Availability Groups and Failover Cluster Instances

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shahgols
shahgols
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.



Grant Fritchey
Grant Fritchey
SSCoach
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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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Perry Whittle
Perry Whittle
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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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"Ya can't make an omelette without breaking just a few eggs" ;-)
shahgols
shahgols
SSChasing Mays
SSChasing Mays (647 reputation)SSChasing Mays (647 reputation)SSChasing Mays (647 reputation)SSChasing Mays (647 reputation)SSChasing Mays (647 reputation)SSChasing Mays (647 reputation)SSChasing Mays (647 reputation)SSChasing Mays (647 reputation)

Group: General Forum Members
Points: 647 Visits: 5727
Thank you!



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