Availability Group for HA versus Failover Cluster Instance for local HA

Last Post 22 Feb 2013 05:37 AM by rm. 3 Replies.
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e90fleet
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21 Feb 2013 08:09 AM
Hi all,

i need your help here please with AlwaysOn architecture.

Here is what we currently have:

Traditional 4 node cluster1 with 3 instances running on 3 nodes (1 instance on each node) and 1 spare node for HA in 1 datacenter1.
The cluster1 is attached to SAN.
Then we have asynchronius mirroring setup from cluster1 to datacenter2 for each database on each instance.


We will be upgrading soon to sql server 2012 and decided that we could use AlwaysOn availablity groups for DR,
but i am a little confused what will be the best architecture for our case.

Basically the requirements for this 24x7 (e-comm application) are:

1) Automatic failover between servers with zero data loss and no performance degradation in datacenter1 first
and if datacenter1 is not available then manual failover with some data loss to datacenter2 is acceptable.

2) We currently have transactional replication but could use one of the secondary readable replica instead of replication.
It is possible to do so to remove replication completly?

Can you please help me with high leve design for this case?

Also, what i don't undestand is what is the difference and in which case each of these below should be used?:

1) Availability Group for HA and DR

and

2) Failover Cluster Instance for local HA and Availability Group for DR

Thanks
rm
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21 Feb 2013 11:33 AM
Based on our testing, have to put all nodes involved in AlwaysOn group in single win2012 cluster, many issues on win2k8 r2 cluster. Regarding replacing replication with read only mirror, you are better to get third server for that. If only has one mirror partner and set it to read only also, user session on partner will block schema changes.
e90fleet
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21 Feb 2013 01:10 PM
Thank you rm,

Can you please explain more about replication? How will that work?

We currently have multiple publishers on different instance and only 1 subscriber on SQL 2008R2.
i am just trying to understand the setup on the high level.
rm
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22 Feb 2013 05:37 AM
That shouldn't be the problem, you may discuss details with prople who set replications on your servers since I don't know your environment.


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