CSV STATUS_IO_TIMEOUT When starting a specific VM


I have the strangest problem with a customers infrastructure that I can’t seem to get to the bottom of.

Server OS Windows Server 2019 Standard

Two Servers in the cluster accessing the CSV on a Dell EMC SC277984 via iSCSI over a 10GB back bone.

Basically long story short, but when rebooting (the act of powering it on) a specific VM it causes the CSV to drain and produces a myriad of errors and mayhem, it takes the entire estate down for about 15 minutes whilst everything begins to resume and power
up again.

This error is found in the event logs.

Cluster Shared Volume ‘Volume1’ (‘Cluster Disk 2’) has entered a paused state because of ‘STATUS_IO_TIMEOUT(c00000b5)’. All I/O will temporarily be queued until a path to the volume is reestablished.

I have tried rebooting the SAN, rebooting the hosts running a Cluster Validation Test (passes with no errors) 

I’m keen to try removing the role itself from the cluster and recreating the VM in hyper-V from scratch and re-attaching it’s original disks but haven’t had the opportunity to try this yet.

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