Hi, We have Windows 2016 cluster with two VMs located at two different sites). How many heartbeat loss can cause the cluster to failover? (no change on network threshhold) Thank you for your help.

Hi @John JY , The table below lists properties to tune cluster heartbeats along with default and maximum values: Source: https://techcommunity.microsoft.com/t5/failover-clustering/tuning-failover-cluster-network-thresholds/ba-p/371834 ---------- If the reply was helpful please don't forget to upvote and/or accept as answer , thank you! Best regards, Leon

cluster failedover - Microsoft Q&A

Accepted answer

Leon Laude 85,666 Reputation points

2021-09-12T07:07:21.46+00:00

Hi @John JY ,

The table below lists properties to tune cluster heartbeats along with default and maximum values:

Source:
https://techcommunity.microsoft.com/t5/failover-clustering/tuning-failover-cluster-network-thresholds/ba-p/371834

----------

If the reply was helpful please don't forget to upvote and/or accept as answer, thank you!

Best regards,
Leon
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John JY 221 Reputation points

2021-09-13T00:37:08.623+00:00

Hi @Leon Laude ,

Thank you very much for your info.
If CrossSubnetDelay=4 and CrossSubnetThreshold=20, When the failover would occur?

Thank you!

Leon Laude 85,666 Reputation points

2021-09-13T06:25:53.56+00:00

For example setting CrossSubnetDelay to send a heartbeat every 4 seconds and setting the CrossSubnetThreshold to 20 heartbeats missed before taking recovery, means that the cluster can have a total network tolerance of 80 seconds before recovery action is taken.

John JY 221 Reputation points

2021-09-16T15:31:51.84+00:00

@Leon Laude

Should it be 80 seconds before recovery action is taken in my case?

Thank you!

Leon Laude 85,666 Reputation points

2021-09-16T15:42:41.95+00:00

Yes correct, 80 seconds.

John JY 221 Reputation points

2021-09-19T17:25:55.95+00:00

@Leon Laude
Still thought about this heartbeat issue.

in this case, which node sent heartbeat? how did they detect loss and failover to Node2 at DR site?

two VMware nodes(one at production site and one at DR site(FSW at DR site)(windows 2012R2 up)
Node1(1NIC ) ----- Node2 (1NIC)+FSW (storage appliance)
Production site ---- DR site

appreciate your help and knowledge.

Thank you!
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