I'm investigating whether there are issues running OMV virtualized (using ESXi) and passing the harddrives to OMV using raw device mapping (RDM).
It seems that RDM is pretty dangerous when using ZFS, but are there certain issues when using EXT4? I've heard that it's a bit unclear how ESXi is handling disk errors and it might disconnect your disk from your client OS when your disk is struggling, but that may be solved using WD RED disks with TLER functionality.
One other thing is that the SMART data won't be passed through, but perhaps I could check/monitor that in the virtualization environment?
I would like to hear some thoughts from you.