If I have 4 nodes in Hyper V cluster how many nodes can I afford to loose?

Question

If I have 4 nodes in the Hyper V cluster how many nodes can I afford to lose?
If I have 5 nodes in the Hyper V cluster how many nodes can I afford to lose?

Answer 1

Hi,

Based on dynamic quorum, it is enough that have one is running.

Answer 2

Hello,
depends of configuration if you have failover cluster and you have 4 nodes you should use a witness and the same nodes you can loos as in 5.

Additionally it depends how many resourced do you use, if you use 60% of cluster resources you cannot lose to many nodes :)

Answer 3

@Jarosław Kossakowski I did not understand what you tried explaining here. Please can you write in detail.

Answer 4

Hi MohdArif-3014,

The answer to this depends on a number of factors, all of which are unknown here.

You need to ask yourself, how many nodes (and their resources) are needed in order to keep your VMs running. I have always ensured that I don't run over 50% total capacity so that in the event of node failure, there's enough to keep everything running.

Therefore, the answer to your question very much depends on how you have your Hyper-V configured and how many resources your VMs need in order to run.

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Answer 5

if you have 4 nodes with each node running at 50% resource utilisation (vcpu and RAM), you can fail up to 2 nodes as all the vms after failing over, will cause resource utilisation to the remaining 2 surviving nodes to fill up to 100%

so its not just based on how many nodes you have in the cluster but also your total load utilisation across the cluster