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.