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Storage connectivity lost

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Hello everyone,
I have the following question: frequently on a cluster windows server 2012 Hyper-V the disks present in storage are disconnected. Sometimes thedisconnection is so long that the virtual machines are turned off. The message that I read in the logs is: "Cluster Shared Volume 'Volume1' is no longer available on this node Because Of 'STATUS_CONNECTION_DISCONNECTED (c000020c).' All I / O will temporarily be queued until a path to the volume is reestablished. "
The connection is made via iSCSI adapters. I checked all iscsi configurations on the servers that are part of the cluster and everything seems ok. I don't know what else to check ...

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