VirtualMachineManager vmm = gm_.searchVmWithName(vmName_);
assert vmm != null;
vmm.createSnapshot(snapName);
SnapshotManager spm = vmm.searchSnapshotWithName(snapName);
System.out.printf("-----disk list of %s of %s-----\n",
spm.getName(), spm.getVirtualMachine().getName());
Utility.printList(spm.getConfig().getAllDiskNameList());
System.out.printf("-----vmdkinfo list-----\n");