Ubuntu 20.04 on vSphere 6.7, log error SDA/SGIO
The problem is that VMWare by default doesn’t provide information needed by udev to generate /dev/disk/by-id entries. Apart from ESX, VMWare Workstation is also affected. The resolution is to put disk.EnableUUID = "TRUE" to the virtual machine definition, i.e. into the *.vmx file or via Edit Settings -> Options tab -> General -> Configuration Parameters in ESX UI. After rebooting VM with this parameter set, the disk are visible in /dev/disk/by-id and multipathd doesn’t complain anymore. I had to power off the VM, and then go to Edit Settings -> VM Options -> Advanced -> EDIT CONFIGURATION.