[vbox-dev] fixed - VHD not readable by Hyper-V
Huihong Luo
huisinro at yahoo.com
Mon Nov 9 20:06:01 GMT 2009
I noted that VDCopy is now in svn, thx.
the Hyper-V not recognized patch (VHDHDDCore.cpp) is still not in, just in case you guys forgot it
--- On Thu, 11/5/09, Huihong Luo <huisinro at yahoo.com> wrote:
From: Huihong Luo <huisinro at yahoo.com>
Subject: Re: [vbox-dev] fixed - VHD not readable by Hyper-V
To: "Klaus Espenlaub" <Klaus.Espenlaub at Sun.COM>
Cc: "vbox-dev at virtualbox.org" <vbox-dev at virtualbox.org>
Date: Thursday, November 5, 2009, 5:23 PM
just a kind remainder, the fix hasn't been checked into svn yet.
We've been running on VHDs with fix for last couple of weeks, seems to be no side effects.
also need to check in the VDCopy patch
--- On Thu, 10/15/09, Klaus Espenlaub <Klaus.Espenlaub at Sun.COM> wrote:
From: Klaus Espenlaub <Klaus.Espenlaub at Sun.COM>
Subject: Re: [vbox-dev] fixed - VHD not readable by Hyper-V
To: "Huihong Luo" <huisinro at yahoo.com>
Cc: "vbox-dev at virtualbox.org" <vbox-dev at virtualbox.org>
Date: Thursday, October 15, 2009, 4:24 AM
Huihong Luo wrote:
> found another bug, I've attached the patch
> two bugs:
> (1) parent locators set to zero for base images
> (2) block allocation table to be block-size aligned (2M)
> after these two fixes, vbox vhds works well on Hyper-V, I tested quite some large vhd files from p2v, all works fine now.
> These two fixes should be very safe to check in, (not sure if it may break snapshots, though)
Thanks a lot for those fixes (and the previous ones as well), I'll try to find time myself to apply them in the near future - or find someone else who will handle it.
What I wanted to ask earlier already - did you read http://www.virtualbox.org/wiki/Contributor_information ? Which of the two contribution options (SCA or MIT licensed patches) do you pick?
Again, we're very grateful for the excellent contributions.
Klaus
> - hl
>
> --- On *Tue, 10/13/09, Huihong Luo /<huisinro at yahoo.com>/* wrote:
>
>
> From: Huihong Luo <huisinro at yahoo.com>
> Subject: Re: [vbox-dev] Fwd: VHD not readable by Hyper-V
> To: "vbox-dev at virtualbox.org" <vbox-dev at virtualbox.org>
> Date: Tuesday, October 13, 2009, 1:40 PM
>
> I found the vhd bug on vbox implementation. vbox mistakenly sets
> parent locators ("wi2r", etc.) for base vhd image. If setting these
> fields to zeros for base image, Hyper-V is happy. Should be very
> easy to fix, if you need the code diff, let me know
>
> VBox The MS spec states:
>
> Parent Locator Entries
>
> These entries store an absolute byte offset in the file where the
> parent locator for a differencing hard disk is stored. This field is
> used only for differencing disks and should be set to zero for
> dynamic disks.
>
>
> --- On *Tue, 10/13/09, Huihong Luo /<huisinro at yahoo.com>/* wrote:
>
>
> From: Huihong Luo <huisinro at yahoo.com>
> Subject: [vbox-dev] Fwd: VHD not readable by Hyper-V
> To: "vbox-dev at virtualbox.org" <vbox-dev at virtualbox.org>
> Date: Tuesday, October 13, 2009, 6:49 AM
>
>
>
> Sent from my iPhone
>
> Begin forwarded message:
>
>> *From:* Huihong Luo <huisinro at yahoo.com>
>> *Date:* October 13, 2009 6:35:42 AM PDT
>> *To:* Shu Wu <superwushu at gmail.com>
>> *Subject:* *Re: [vbox-dev] VHD not readable by Hyper-V*
>>
>> No problem with vpc, vbox also understands vhds from hyper-v
>>
>> It is just that hyper-v doesn't understand vbox's vhd
>> Sent from my iPhone
>>
>> On Oct 13, 2009, at 2:27 AM, Shu Wu <superwushu at gmail.com> wrote:
>>
>>> Can your VHD disk be read by Virtual PC or Virtual Server? It
>>> seems that Hyper-V and Virtual-PC share the same vhd format.
>>> One year ago I wrote my own program to generate a vhd file
>>> and make it to be accepted by Virtual PC, just following the
>>> official vhd specification. But I haven't tested it on Hyper-V.
>>>
>>> Cheers,
>>>
>>> Wu Shu
>>>
>>> 2009/10/13 Klaus Espenlaub <Klaus.Espenlaub at sun.com>
>>>
>>> Huihong Luo wrote:
>>>
>>> None of vbox created vhd disk files are readable by
>>> 2008 Hyper-V.
>>> This is the error: "The file or directory is
>>> corrupted and unreadable"
>>> I am debugging through the code, trying to change
>>> Footer info, such as version, creator OS, checksun,
>>> etc., to see it can correct the error.
>>> If you know what might be wrong, pls post
>>>
>>>
>>> We only know what Microsoft documents in their VHD format
>>> spec, which we believe to have correctly implemented.
>>> However as usual those specs are incomplete and not
>>> really precise, so there's plenty of room for different
>>> interpretations.
>>>
>>> Klaus
>>>
>>>
>>> _______________________________________________
>>> vbox-dev mailing list
>>> vbox-dev at virtualbox.org
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>>>
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