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RDM multi-writer clustered windows

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Hello,

 

I configuring a windows 2016 cluster on two VMs in 6.5 compatibility mode, when adding an existing physical RDM on the second node, error appears that the file can not be opened.

 

I changed the RDM option to multi-writer and managed to add RDM on the second node.

 

However, I have another Windows 2008 R2 cluster with VMs in 5.5-mode compatibility in the same VMware environment and meet physical rdm disks in non-shared mode and it works normally.

 

Why did I need to set up multi-writer?

 

Thank you.


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