Which nodes are active in a multi-subnet failover cluster?

All we need is an easy explanation of the problem, so here it is.

I have previously worked with FCI where there are 2 nodes. 1 server is active and other service is not active. Both share the same disk. If node 1 or sql server service on node 1 goes down, then it starts up the sql server service on node 2.

In a multi-subnet failover cluster, which of the below nodes are active and which are passive?

Which nodes are active in a multi-subnet failover cluster?

How to solve :

I know you bored from this bug, So we are here to help you! Take a deep breath and look at the explanation of your problem. We have many solutions to this problem, But we recommend you to use the first method because it is tested & true method that will 100% work for you.

Method 1

Looking at the Microsoft doc you copied that image from, that is a single stretch cluster spanning multiple subnets. It’s not possible to say from the image which would be the primary, beyond only saying one of the 4 could be the primary at a time.

In simple terms, other than the fact it spans multiple subnets and has storage replicated, it would still act like a traditional FCI in that only one node is primary at a time.

Note: Use and implement method 1 because this method fully tested our system.
Thank you 🙂

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