I’d first like to point out that although the VMDKs are shared between hosts using a shared SCSI BUS they are not synched, meaning that if you write to the mounted point on any machine it will not display on other machines with the same mount point until you remount the drive. Annoying, but understandable.
First off all machines that you want to share this VMDK with will need to be OFFLINE.
Next up we create the VMDK, I find it easiest to do this by adding hardware to an already existing machine, I’m going to use one that I want the VMDK shared with to make it even simpler.
You will need to enable clustering features as shown below, this means you cannot use thin provisioning.
You will need to add the VMDK to a new SCSI BUS, this will usually begin with 1: or …