Virtual Hardware 7 Undocumented Feature Revealed!

So after my last post, VMware did some digging and the real reason for the initially odd behaviour was exposed – it’s a combination of the way Virtual Hardware 7 presents virtual disks to Guests, and the difference in default policy settings of Windows Server 2008 Standard Edition and Windows Server 2008 Enterprise Edition.

So in a nutshell, as Rob elaborates in the comments to my earlier post, it turns out Virtual Hardware 7 presents virtual disks as SAN devices – not as local disks. This resulted in the default SAN policy of WS2008EE offlining everything bar the boot volume during installation. To be honest, this is actually a good setting to have IMHO – I wouldnt trust Windows admins with clustering either. To anyone who I work with or have worked with, that last sentence was clearly a joke :D!

The VMware KB article has been drastically overhauled so no one else will be in the dark in the future, and hopefully stuff like this will also show up in the Guest OS installation guide where it really belongs.

So in the end we all learned something which is always good, and it goes to show that VMware’s response to potential bugs is in fact anything but woeful. Hurray!

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9 Responses to “Virtual Hardware 7 Undocumented Feature Revealed!”

  1. Jason Boche Says:

    Wow. Wow. Wow.

  2. Michael Poore Says:

    I think that I may have seen this happenning on 3.5 U3 with Windows 2008 R2 Datacenter guests. Just haven’t got as far as investigating yet.

    • stu Says:

      Interesting! Let me know if you find anything… i haven’t tested with Virtual Hardware 4 on vSphere yet, but will try and get around to it one of these days. I have tried on the LSI Parallel SCSI adapter and VH7 though, same result interestingly even though that adapter doesn’t support the required command set for WS2008 clustering!

  3. Virtual Hardware 7 Undocumented Feature Revealed! « new hardware Says:

    […] the original post: Virtual Hardware 7 Undocumented Feature Revealed! 02 Nov 09 | […]

  4. Virtual On | Daily Gaming Blog Says:

    […] Virtual Hardware 7 Undocumented Feature Revealed! Share and Enjoy: […]

  5. Ian K Says:

    Rocking!! Whoever said the community carries no weight. Congrats Jason!

  6. Leif Says:

    Thanks for keeping us updated on this!

  7. RTFM Education » Blog Archive » vInternals - Virtual Hardware 7 Undocumented Feature Revealed! Says:

    […] http://vinternals.com/2009/11/virtual-hardware-7-undocumented-feature-revealed/ […]

  8. VM Hardware Version 7 and Windows Server 2008 - blog.scottlowe.org - The weblog of an IT pro specializing in virtualization, storage, and servers Says:

    […] Stu posted an update with more information and an explanation for the unexpected behavior, so be sure to check it […]

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