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What will be the default instance name on a SQL Server failover cluster (2 nodes) Expand / Collapse
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Posted Tuesday, November 27, 2012 2:54 PM
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Hi,
What will be the default instance name on a SQL Server failover cluster (2 nodes).

I have an active/active sql server failover cluster and I want to install a default instance and a named instance. I have always installed named instances on clusters and I guess that the name of the default instance on a SQL server failover cluster is the SQL virtual name which is requested during installation. And on that case we can decide that name. Am I correct?

I was a little confused as on a standalone sql default instance the sql default instance name is the Host name.

Thanks
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Posted Tuesday, November 27, 2012 3:07 PM


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the default instance name will be what ever you specify in the "SQL Server Network Name" on the "Instance Configuration" screen (same screen you choose default or named insatnce)

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Post #1389431
Posted Tuesday, November 27, 2012 4:48 PM
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Is there a distinction between a default instance and a named instance in clustered SQL installations? I don't think so, because a clustered instance always uses a network name/IP that is different from the host. That's why you don't need to change client connection strings after a failover.
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Posted Wednesday, November 28, 2012 1:48 AM


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APA0876 (11/27/2012)
Hi,
What will be the default instance name on a SQL Server failover cluster (2 nodes).

I have an active/active sql server failover cluster and I want to install a default instance and a named instance. I have always installed named instances on clusters and I guess that the name of the default instance on a SQL server failover cluster is the SQL virtual name which is requested during installation. And on that case we can decide that name. Am I correct?

I was a little confused as on a standalone sql default instance the sql default instance name is the Host name.

Thanks

You are correct, a default instance uses just the supplied virtual networkname to connect.


dan-572483 (11/27/2012)
Is there a distinction between a default instance and a named instance in clustered SQL installations?

Yes, of course there is. Default or named has nothing to do with host name or anything else. It is the name of the SQL Server instance as supplied during installation. A default instance merely uses just the host name or if in a cluster the assigned virtual networkname, whereas a named instance combines with the hostname or virtual networkname.


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Posted Wednesday, November 28, 2012 9:46 AM
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Interesting... So a 2-Node failover cluster can host multiple default instances (using separate network names & IPs & drives). Can a single clustered Network resource contain a default instance and multiple named SQL instances that share drives?
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Posted Wednesday, November 28, 2012 11:58 AM


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dan-572483 (11/28/2012)
Interesting... So a 2-Node failover cluster can host multiple default instances (using separate network names & IPs & drives).

No, it can't and that's not what I said. It doesn't matter whether its a clustered or non clustered instance, only 1 default instance. When you install a SQL server instance, the instance name supplied is used to create and identify the instance registry branch (among other things).

dan-572483 (11/28/2012)
Can a single clustered Network resource contain a default instance and multiple named SQL instances that share drives?

a unique network name is required for each instance, like a windows computername, they must be unique in the domain.


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Post #1390032
Posted Wednesday, November 28, 2012 12:06 PM
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Actually you can only have one default instance, any additional ones have to be named. This is no different from a standalone server, and is due to the fact that the service names must be unique, in case you are in a situation where multiple instances are running on the same node.

If you had 2 default instances they would both need a service called MSSQLSERVER, which is obviously not possible. Likewise 2 named instances called A would need a service called MSSQL$A.

In answer to your other question, each instance needs its own storage that is added as a resource to its cluster group. It is not possible to share storage between instances.



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