Virtual machines losing time

[k3lvin]

I have a server running Microsoft Virtual PC 2007 and it is hosting 4 virtual machines. The virtual machines keep loosing time. The server running Virtual PC has the exact time. This is a big problem as these machines need to run tasks at certain times. This is a domain environment so all hosts that are connected to the domain always have the exact time using the Windows Time service (W32Time) which syncs to the PDC on our domain.

Some websites have suggested to edit the .vmc file. I have tried adding this into the file but this has not fixed the problem:

"<components>
<host_time_sync>
<enabled type="boolean">false</enabled>
</host_time_sync>
</components>"

Any ideas??

 

[flyboytim]

Just an observation:

"<components>
<host_time_sync>
<enabled type="boolean">false</enabled>
</host_time_sync>
</components>"

Shouldn't this be set to "true"?

In Virtual Server 2005, it is important that this entry is lowercase, not Capitalcase or UPPERCASE.

 

[k3lvin]

I think this is set to false so the virtual machine does not sync the time with the host, instead it will host with the DC, but it still seems to be about 45 seconds out, if its syncing with the host is should be with in 2 seconds.

 

[k3lvin]

Made a mistake in my wording:

I think this is set to false so the virtual machine does not sync the time with the host, instead it will *SYNC with the DC

 

[Nelviticus]

By coincidence, Microsoft's 'Virtual PC Guy' has just written a post about time synchronisation under Hyper-V in which he explains why VMs lose time synchronisation:
Time Synchronization in Hyper-V

Nelviticus

 

[flyboytim]

Microsoft Virtual server is set to <host time sync> every 15 seconds if the defaults are used and is set to "true", according to this KB article:

http://support.microsoft.com/kb/888746

Is running Virtual PC 2007 the correct solution for your requirements?