Archive for the ‘Hyper-V R2’ Category

Timedrift with Linux Guest VM under Hyper-V R2

January 21, 2010 4 comments

Recently had a Linux guest VM timedrifting considerably under Hyper-V R2. I contacted the Linux IC team, who responded stating there was a known issue and they had written a script to “work around” it 🙂

Below is the Linux Clock Sync script.

DISCLAIMER: I did not write this script, nor will I be able to support you on the use of it. Any issues should be sent to the support email address at the end of the script.

Read more…


SLES 10.2 under Hyper-V

December 23, 2009 Leave a comment

SMP is not supported in Linux VM’s at this time with the IC’s loaded. If the IC’s aren’t loaded, then SMP works, albeit with lower I/O performance. Linux VM’s without IC’s are not supported by Microsoft.

You will find that attempting to boot the VM in SMP mode with IC’s loaded you will get the following;


VMBUS: SynIC version: 1

Moving forward, MS have identified the fix and will fix it in a future release. To fix the issue, you need to compile your own 2.6.32 kernel and apply a patch to make the IC’s SMP safe. At this time, the SMP fix is not publically available.

Enabling Disk management from remote Server/PC in Server 2008 R2 (or Hyper-V R2)

December 10, 2009 Leave a comment

Needs to be run on both the Client and Server;


netsh advfirewall firewall set rule group="Remote Volume Management" new enable=yes

Disabling the firewall in Windows Server 2008 R2 Core Edition (and Hyper-V Standalone)

December 10, 2009 Leave a comment



netsh advfirewall set allprofiles state off
Categories: Hyper-V R2, Windows 2008

Issues migrating VM between Hyper-V hosts – “Unknown processor”

December 10, 2009 Leave a comment



Easy one. Ensure XD (Execute Disabled) and VT (Virtualisation Technology) are enabled in the BIOS.



Installing MSA2000 MPIO drivers under Hyper-V R2 Standalone

November 26, 2009 Leave a comment

This caused me a few headaches the other night.


Start off by enabling MPIO support from the command line – “start /w ocsetup MultipathIo” does the trick;


Next run up the MPIO control panel applet – simply “MPIOCPL” from command prompt


On the subsequent window, browse to “DSM Install” and type the path to your hp MPIO driver file. Then click install. It will prompt you to reboot, do so.


Run a disk scan and you will see MPIO isn’t working yet. *sigh* back into MPIOCPL, and go to “Discover Multi-Paths” – you will see a new device here now (that wasn’t there before);

imageClick the Device Hardware Id and click “Add”. Again, reboot when prompted and run a re-scan when the server is back up – and voila you should have MPIO presented LUN’s!!!