We have a Dell PowerVault 3620f (fiber) and I am getting the following errors in the Windows event log. I am no good with fiber zoning so I would need to pull in someone to take a look but figured I would ask here first. We also have a mirrored setup at another location with the same hardware and I am not seeing the issue. Looking at the MDSM, I don't see any issues. The SAN and server are out of support, otherwise I would call Dell.
Dell MD Series Device Specific Module for Multi-Path failed to return a Path to \Device\MPIODisk2.