Question about updating SQL Server on failover cluster

Hi all,
I would like to better understand the update process of SQL Server (2008 r2) in a failover cluster environment.
In our cluster we have 4 instances of SQL running, where two of them I am able to at anytime stop the instance and update it.
The question is... Applying the latest update, will update forcibly all instances installed on that node, or do I have the ability to choose which instance I want to update?
This way, I could "test" the update process in those two SQL Instances, as described in http://support.microsoft.com/kb/958734 and after finishing I would update the remaining instances.
Please let me know.
Thanks in advance.
Nuno Silva

Hi Nuno,
It's a failover cluster issue, I moved it to SQL Server High Availability and Disaster Recovery. So that you can get better help.
Regards,
Charlie Liao
TechNet Community Support

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