Thanks for your response,

I am thinking that I updated Node B inappropiatedly :ermm:

all this issue for me is related with failover cluster manager and how is distributed the charge between nodes.

I am looking for ways to pause failover between nodes, so I can run again service pack 3

meanwhile, all SQL Server instances are running (if you have any idea on how to do this I will appreciate).

Sincerely,

Newbie with cluster management and

Thanks again for your idea.