Sets the undo-disks mode for the virtual machine.
PRL_RESULT PrlVmCfg_SetUndoDisksMode( PRL_HANDLE hVmCfg, PRL_UNDO_DISKS_MODE nUndoDisksMode );
PrlApiVm.h
PRL_RESULT. Possible values:
PRL_ERR_INVALID_ARG - invalid handle or null pointer was passed.
PRL_ERR_SUCCESS - function completed successfully.