High availability is not supported on VMware.
As for other limitations under VMware, the following information is excerpted from the upcoming v 3.0 Admin Manual:
While the basic functionality of Guardian is not affected by running as a virtual appliance, the following limitations apply:
Guardian can use only the fixed disk space assigned to the virtual host during its installation: it is not possible to modify the size of the disks later, neither can Guardian be used in on-demand disk allocation scenarios.
Guardian currently does not comply with the VMware Ready program and does not have vmware-tools installed. As a result, Guardian does not support VMotion and it is not possible to integrate it into an existing VMware infrastructure.
High availability mode is not supported in VMware.
Hardware-related alerts and status indicators of Guardian may display inaccurate information, for example, display degraded RAID status.
The Bridge operation mode of Guardian cannot be used in VMware.
Sep 06 '10 at 09:14
Jussi Valkiainen ♦♦