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differencing VHDs grow in size

Source: microsoft.public.virtualpc
Sent: 03/23/2009
From: rgherzog
Message:

Hi all!

Why do my differencing virtual hard disk grow in size to an extent I
wouldn't have expected?

- After the first Startup and Shutdown: It's size jumps to 0.5GB
- After some hours of usage (using a vpn client, windows remote desktop an
internet explorer): It's size jumped once again to 4GB

My parent virtual pc hosts two hard virutal hard drives - drive c containing
at about 5GB and drive e containing at 5GB as well. For my child vhds i
created two differencing hard disks as well, whereas it's only drive c that
grows in size. Drive e keeps low (probably because I havn't used the programs
installed in drive e?!)

What can i do, to avoid that growth in size?

Thanks in advance for your suggestions and comments.

regards, reinhart

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Related Messages

RE: differencing VHDs grow in size

Sent: 03/23/2009
From: jorgensen
Message:

Properly the child's virtual memory file that is growing.
You could try a fixed size.

RE: differencing VHDs grow in size

Sent: 03/23/2009
From: rgherzog
Message:

"jorgensen" wrote:

I didn't know that it is possible to set a fixed size for differencing vhds.

What is the virtual memory file?

regards,reinhart

Show quoted text

> Properly the child's virtual memory file that is growing.
> You could try a fixed size.

differencing VHDs grow in size

Sent: 03/23/2009
From: rgherzog
Message:

Do you have any suggestions about how to reduce the extent the differencing
vhd increases in size or is this just normal behaviour?

This is what I would like to know.

regards reinhart

Re: differencing VHDs grow in size

Sent: 03/23/2009
From: rgherzog
Message:

Hi Robert!

Do you have any idea or suggestions about how to reduce the extent how much
the differencing vhd increases in size; or is this just normal behaviour and
behviour by design?

This is what I acctually would like to know.

regards, reinhart

"Robert Comer" wrote:

Show quoted text

> >What is the virtual memory file?
>
> It's the swap file. (pagefile.sys for Windows NT and above)
>
> To set it as a specific size in XP, go into the control panel, System,
> Advanced tab, performance settings button, advanced tab, then change
> button on the bottom.
>
> But that's only going to change things a bit, the OS and programs are
> always changing files and that's why the size jumps on the C drive.
>
> --
> Bob Comer
>
>
> On Mon, 23 Mar 2009 04:58:02 -0700, rgherzog
> <(email address - cut out)> wrote:
>
> >
> >
> >"jorgensen" wrote:
> >
> >> Properly the child's virtual memory file that is growing.
> >> You could try a fixed size.
> >
> >I didn't know that it is possible to set a fixed size for differencing vhds.
> >
> >What is the virtual memory file?
> >
> >regards,reinhart
>

Re: differencing VHDs grow in size

Sent: 03/23/2009
From: Robert Comer <(email address - cut out)>
Message:

>What is the virtual memory file?

It's the swap file. (pagefile.sys for Windows NT and above)

To set it as a specific size in XP, go into the control panel, System,
Advanced tab, performance settings button, advanced tab, then change
button on the bottom.

But that's only going to change things a bit, the OS and programs are
always changing files and that's why the size jumps on the C drive.

--
Bob Comer

On Mon, 23 Mar 2009 04:58:02 -0700, rgherzog
<(email address - cut out)> wrote:

Show quoted text

>
>
>"jorgensen" wrote:
>
>> Properly the child's virtual memory file that is growing.
>> You could try a fixed size.
>
>I didn't know that it is possible to set a fixed size for differencing vhds.
>
>What is the virtual memory file?
>
>regards,reinhart

Re: differencing VHDs grow in size

Sent: 03/23/2009
From: Robert Comer <(email address - cut out)>
Message:

>Do you have any idea or suggestions about how to reduce the extent how much

Changing the page file to a static size helps, but otherwise it's
pretty much just normal behavior for a dynamic environment. Minimizing
changes in the VM is about all you can do.

Setting the page file to a static size should be done before creating
the differencing disk..

--
Bob Comer

On Mon, 23 Mar 2009 07:31:01 -0700, rgherzog
<(email address - cut out)> wrote:

Show quoted text

>the differencing vhd increases in size; or is this just normal behaviour and
>behviour by design?
>Hi Robert!
>
>Do you have any idea or suggestions about how to reduce the extent how much
>the differencing vhd increases in size; or is this just normal behaviour and
>behviour by design?
>
>This is what I acctually would like to know.
>
>regards, reinhart
>
>"Robert Comer" wrote:
>
>> >What is the virtual memory file?
>>
>> It's the swap file. (pagefile.sys for Windows NT and above)
>>
>> To set it as a specific size in XP, go into the control panel, System,
>> Advanced tab, performance settings button, advanced tab, then change
>> button on the bottom.
>>
>> But that's only going to change things a bit, the OS and programs are
>> always changing files and that's why the size jumps on the C drive.
>>
>> --
>> Bob Comer
>>
>>
>> On Mon, 23 Mar 2009 04:58:02 -0700, rgherzog
>> <(email address - cut out)> wrote:
>>
>> >
>> >
>> >"jorgensen" wrote:
>> >
>> >> Properly the child's virtual memory file that is growing.
>> >> You could try a fixed size.
>> >
>> >I didn't know that it is possible to set a fixed size for differencing vhds.
>> >
>> >What is the virtual memory file?
>> >
>> >regards,reinhart
>>

Re: differencing VHDs grow in size

Sent: 03/23/2009
From: "jorgensen" <(email address - cut out)>
Message:

> Setting the page file to a static size should be done before creating the

Using one of the better defragment programs and the 'Compact it' feature of
VPCs Virtual Disk Wizard also can shrink a VHD file back.

Show quoted text

> differencing disk..

Post Reply | This is Spam! | Mark as Spam

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