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windows 2012 standard cluster and san

Posted on 2013-01-22
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i am after some information.  if you a failover cluster stretching from one site to another lets say for the purpose of sql with only 2 nodes on different subnets.  you also have a san with san replication in place

lets say the cluster is failed over. what happens to the storage?

would the cluster look to the primary site for the storage still if the san was not failed over if so how?  i am slightly confused as to how if a site fails over does the cluster know to look to the local san for the volumes if a san is failed over or if the cluster looks to the primary site to resolve the volumes? is there something in the cluster that knows where to look.

if you could fill in some gaps in my knowledge that would be great.
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Question by:ProjNet
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MattSQL earned 500 total points
ID: 38808801
My understanding of multi subnet clustering is that storage needs to be attached. So even if you are using a san it should be replicated to a san connected to the DR configuration. When the DR site becomes 'primary' it will be pointing to its local SAN just as it always has and always will.

http://www.sqlsoldier.com/wp/sqlserver/multsubnetfailoverclusters
http://www.mssqltips.com/sqlservertip/2728/sql-server-2012-multisubnet-cluster/
http://msdn.microsoft.com/en-us/library/ff878716.aspx
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by:ProjNet
ID: 38809022
Thanks for the information I had seen those pages however I guess what I am really after is knowing how when a cluster fails over does it know to use the san in the DR site?

Scenario.

Site one requires maintenance so the cluster is failed over to the DR site.  The San replication is in place and the san is failed over to the DR site also.  

If the cluster is failed over before the SAN I take it the Cluster will be broken as there is currently no storage on the DR Site and the cluster will not be able to find the shared volumes or does the Cluster still function as it is resolving the volumes by looking at the SAN in Site 1 ?

When the SAN is failed over how does the cluster know where to look for the volumes as the san is technically a different piece of hardware and could be on a different subnet?

I am thinking it is something to do with the SAN (I am not a storage guy but this information is key to me fully understanding the process).
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