Hi
We have installed a new Windows Server 2012 Hyper-V cluster with 4 nodes on an UCS system with NetApp storage. All nodes are booting from iSCSI and there are 2 LUNs connected with iSCSI as a data store (the place for the VHDs). The OnTap version is 8.1.1P1. The connection is done by the integrated Microsoft iSCSI Initiator - without Snapdrive.
If we are copying large files from across LUNs or if we cancel such a copy process, we have issues sometimes, that the cluster nodes are loosing their connectivity to the CSV. Because of that many to all VMs are crashing on the cluster. As long as we are not copying big files on the LUNs, we don't have this problems. Further we experienced file locks, after we cancelled a copy process.
The boot LUNs for the cluster nodes are 40 GB MBR. These are configured with a LUN type of "Windows". The two data store LUNs (5 TB SAS and 5 TB SATA) are configured with a LUN type of "Windows_GPT".
We are not storage specialists - we are focusing on Windows. Further we did not make this configuration. But we think, that a wrong LUN type could cause the problems we have. In our opinion, the LUN type needs to be set to "Windows_2008" in our case (because it's same as for Windows Server 2012).
Can somebody please confirm, that this would be the reason for the troubles we are facing?
Thanks a lot for your replies!
Cheers,
André