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Struggling with what I thought would be a pretty easy setup and can't really see where I am going wrong. I have 2 Dell Hyper-V hosts running Server 2012 R2 connected to a Dell MD3800 SAN via 2 Netgear 10 GB switches.

One The SAN I Have:

Created 3 LUNS Created a hosts group and added both my hosts to it Assigned the LUNs to the host group Assigned IP addresses to my 2 RAID cards

One The Server Side:

Installed iSCSI and MPIO Installed Dell's driver set Added the SAN

Within iSCSI and devices I can see my LUNS but the OS only ever brings through one lUN. The one it brings through behaves as if it was a single disk so both hosts will see it but cannot see data each server has written. I have configures the LUNS as MPIO on both servers. What's going on please?

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    Within iSCSI and devices I can see my LUNS but the OS only ever brings through one lUN - What do you mean exactly? Where are you seeing this? The one it brings through behaves as if it was a single disk so both hosts will see it but cannot see data each server has written - Of course, because it is a single disk. Each server shouldn't be directly writing to it simultaneously. You need to configure it as a Cluster Shared Volume for use with Hyper-V and Failover Clustering. – joeqwerty Jun 20 '17 at 11:19
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Unless you're planning to do sort of a failover cluster with a pass-thru disks (and you're unlikely...) you need to wrap a Cluster Shared Volume (CSV) on top of your shared LUN.

Use Cluster Shared Volumes in a Failover Cluster

If will give you a ClusterStorage combined block/SMB3 share where you'll host all of your VM VHDX files.

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    yeah, CSV is the way to go here. Pass-through disks are not recommended (issues with the failover and migration). it is going to be one of your headaches IMHO. – batistuta09 Jun 28 '17 at 12:59

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