I have a VM with 2 virtual disks under ESXi 5.1.
When the VM is running I can hot remove disk 2 in the VM settings dialog.
However, the remove button is greyed out when the VM is running as soon as I add a PCI device that has been passed through by the ESXi host.
The passthrough device is a SAS controller without any disks connected.
Why is it not possible to hot remove a virtual disk that resides on a datastore that is not related to the passthrough device ?
Is there any parameter that can be modified to enable removal ?