Hi,
Please open Disk Managemt on the node currently owns the cluster disk and see if you can format the iSCSI volume manually. Also check the network status and if there is any heavy task running. Run below PowerShell commands to increase the cluster heartbeat tolerance and see if this helps.
(get-cluster). SameSubnetDelay=2000
(get-cluster). SameSubnetThreshold=10
(get-cluster). CrossSubnetDelay=4000
(get-cluster). CrossSubnetThreshold=20
Best Regards,
Ian Xue
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