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Dynamic .vhd expansion.

Source: microsoft.public.virtualserver
Sent: 01/20/2009
From: Matthew
Message:

Hi, we're running a 2003 VM on a 2008 Hyper-V server with integration
services installed. The VM has two dynamic .vhd's, one for the OS and one
for data. The data .vhd recently expanded from 53GB to well over 100GB.
When I look at the size of the data on the drive inside the VM it's only
using 74GB, not 100GB+. Does anyone know exactly how a dynamic .vhd grows?
Everything I've read says that a dynamic .vhd should consume just over the
ammount of data on the drive. The overage is for header and footer
information. In this case it appears that the .vhd has grown by some
incremental amount rather than by the size of the data being consumed. Is
there any specific documentation on dynamic .vhd growth?

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Related Messages

Re: Dynamic .vhd expansion.

Sent: 01/20/2009
From: "Charlie Russel - MVP" <(email address - cut out)>
Message:

I'm guessing that some process created a really large temporary file or
files and when it was done, the files were deleted. Leaving you with what
you see.

--
Charlie.
http://msmvps.com/blogs/xperts64
http://mvp.support.microsoft.com/profile/charlie.russel

"Matthew" <(email address - cut out)> wrote in message
news:(email address - cut out)...

Show quoted text

> Hi, we're running a 2003 VM on a 2008 Hyper-V server with integration
> services installed. The VM has two dynamic .vhd's, one for the OS and one
> for data. The data .vhd recently expanded from 53GB to well over 100GB.
> When I look at the size of the data on the drive inside the VM it's only
> using 74GB, not 100GB+. Does anyone know exactly how a dynamic .vhd
> grows?
> Everything I've read says that a dynamic .vhd should consume just over the
> ammount of data on the drive. The overage is for header and footer
> information. In this case it appears that the .vhd has grown by some
> incremental amount rather than by the size of the data being consumed. Is
> there any specific documentation on dynamic .vhd growth?

Re: Dynamic .vhd expansion.

Sent: 01/21/2009
From: "Ryan Sokolowski [MVP]" <(email address - cut out)>
Message:

Agreed...or perhaps some sort of application with a memory leak, etc.
Anything that could have been consuming hard drive space (swap file, etc.)
could have caused this... Remember that you can always run a Compact
operation on the VHD which will remove blank space from the VHD file.

Hope this helps,
--Ryan

--
Ryan Sokolowski
MVP - Clustering
MCT, MCITP x3, MCTS x8, MCSE x2, CCNA, CCDA, BCFP

"Charlie Russel - MVP" <(email address - cut out)> wrote in message
news:(email address - cut out)...

Show quoted text

> I'm guessing that some process created a really large temporary file or
> files and when it was done, the files were deleted. Leaving you with what
> you see.
>
> --
> Charlie.
> http://msmvps.com/blogs/xperts64
> http://mvp.support.microsoft.com/profile/charlie.russel
>
> "Matthew" <(email address - cut out)> wrote in message
> news:(email address - cut out)...
>> Hi, we're running a 2003 VM on a 2008 Hyper-V server with integration
>> services installed. The VM has two dynamic .vhd's, one for the OS and
>> one
>> for data. The data .vhd recently expanded from 53GB to well over 100GB.
>> When I look at the size of the data on the drive inside the VM it's only
>> using 74GB, not 100GB+. Does anyone know exactly how a dynamic .vhd
>> grows?
>> Everything I've read says that a dynamic .vhd should consume just over
>> the
>> ammount of data on the drive. The overage is for header and footer
>> information. In this case it appears that the .vhd has grown by some
>> incremental amount rather than by the size of the data being consumed.
>> Is
>> there any specific documentation on dynamic .vhd growth?
>

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