Vista - Dynamically expanding virtual hard disk?

11-29-2008

I just would like to know if anyone here can explain *how* the
dynamically expanding disk grows?

If I compare to an SQLServer database (which I am familiar with) where
one specifies by how much it will expand the database file when
needed, I don't find such a setting for a VHD.

So what is the principle used when the guest needs to store more data
in the disk? A fresh VHD file is very small, like 35 kbytes or so,
what happens when the guest adds data, for example when an operating
system is installed?

Is there a specific amount of host disk space added when it expands?

--

Bo Berglund (Sweden)

11-30-2008

On Sat, 29 Nov 2008 23:45:04 +0100, Bo Berglund <boberglund@xxxxxx>
wrote:

Quote:

>I just would like to know if anyone here can explain *how* the
>dynamically expanding disk grows?
>
>If I compare to an SQLServer database (which I am familiar with) where
>one specifies by how much it will expand the database file when
>needed, I don't find such a setting for a VHD.
>
>So what is the principle used when the guest needs to store more data
>in the disk? A fresh VHD file is very small, like 35 kbytes or so,
>what happens when the guest adds data, for example when an operating
>system is installed?
>
>Is there a specific amount of host disk space added when it expands?

Previously, its been in 2MB chunks.

--
Cheers,
Steve Jain, Virtual Machine MVP
http://vpc.essjae.com/

11-29-2008	#1 (permalink)
Bo Berglund n/a posts	Dynamically expanding virtual hard disk? I just would like to know if anyone here can explain how the dynamically expanding disk grows? If I compare to an SQLServer database (which I am familiar with) where one specifies by how much it will expand the database file when needed, I don't find such a setting for a VHD. So what is the principle used when the guest needs to store more data in the disk? A fresh VHD file is very small, like 35 kbytes or so, what happens when the guest adds data, for example when an operating system is installed? Is there a specific amount of host disk space added when it expands? -- Bo Berglund (Sweden)
My System Specs

11-30-2008	#2 (permalink)
Steve Jain [MVP] n/a posts	Re: Dynamically expanding virtual hard disk? On Sat, 29 Nov 2008 23:45:04 +0100, Bo Berglund <boberglund@xxxxxx> wrote: Quote: >I just would like to know if anyone here can explain how the >dynamically expanding disk grows? > >If I compare to an SQLServer database (which I am familiar with) where >one specifies by how much it will expand the database file when >needed, I don't find such a setting for a VHD. > >So what is the principle used when the guest needs to store more data >in the disk? A fresh VHD file is very small, like 35 kbytes or so, >what happens when the guest adds data, for example when an operating >system is installed? > >Is there a specific amount of host disk space added when it expands? Previously, its been in 2MB chunks. -- Cheers, Steve Jain, Virtual Machine MVP http://vpc.essjae.com/
My System Specs

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