Seems to be a problem with Intel I/OAT ... I disabled I/OAT in BIOS and this issues was gone.

But: There is still a problem with the Hyper-V VMs - sometimes while DSS failover the VMs running on cluster are crashing ...

It seems that the DSS failover is not fully transparent to the iSCSI initiator and the VMs ... I lose only 1 ping on iSCSI LAN connection while failover, but the cluster disks are going offline and online again and that's not good for the running VMs ...

Is open-e working on this issues?