How-to boost Microsoft Virtual Server 2005 Guest Performance

re: How-to boost Microsoft Virtual Server 2005 Guest Performance

Adam Hill — Mon, 07 Feb 2005 16:53:00 GMT

I folowed directions and did the Add/Remove 'Virtual Additions' as well but - Whenever I try to boot via the scsi(0) entry I get an error:
"Windows could not start because of a computer disk hardware configuration problem. Could not read from the selected boot disk. Check boot path and disk hardware."

But I can still reset, pick to boot via the multi(0) entry and 2003 boots fine and in Device Manager, under 'Disk drives' the disk shows up as a 'MS Virtual SCSI Disk Drive'

I have triple checked boot.ini and only changed multi(0) to scsi(0).

Is it working as under a SCSI Adapter without using the new boot.ini entry?

Any ideas?

re: How-to boost Microsoft Virtual Server 2005 Guest Performance

John Howard [MSFT] — Mon, 07 Feb 2005 17:07:00 GMT

Adam

It sounds like the .vhd file isn't attached to the first SCSI adapter as the first SCSI disk as you can still boot from "IDE". Are you saying that when you can still select the previous option (ie IDE) from the boot list and it works without changing anything in the Virtual Server configuration website itself? This would not be expected if the disk were attached to the SCSI adapter - I'll have to try, but I didn't believe the same disk could be attached to two adapters (ie IDE and the SCSI) at the same time?

Can you confirm which bus the disk is attached to, and if it is SCSI, post up or email me your boot.ini file. Maybe also useful would be a screen-shot of your VM configuration in the web admin site, and the two XML sections from the .vmc file: <ide_adapter> and <scsi_adapter>

Just one other thought, if you watch the BIOS startup in your VM, do you see a disk attached under ID0, LUN0 in the Adapter 3.10 BIOS?

Hope this helps.
Regards,
John.

re: How-to boost Microsoft Virtual Server 2005 Guest Performance

Aaron Foster — Fri, 11 Feb 2005 05:52:00 GMT

I too tried to do this, and got the EXACT same results as Adam Hill. Here are the 2 XML section from the .vmc As for the screen shot, it's posted here:http://masoj.vekis.com/images/screenshot.jpg

<ide_adapter>
<ide_controller id="1">
<location id="0">
<drive_type type="integer">2</drive_type>
<pathname>

<absolute type="string">C:\Program Files\Microsoft Virtual Server\Virtual Machine Additions\VMAdditions.iso</absolute>

<relative type="string">..\..\Program Files\Microsoft Virtual Server\Virtual Machine Additions\VMAdditions.iso</relative>

</pathname>
</location>
</ide_controller>
</ide_adapter>

<scsi_adapter>
<controller_count type="integer">1</controller_count>
<scsi_controller id="0">
<adapter_scsi_id type="integer">7</adapter_scsi_id>
<adapter_shared type="boolean">false</adapter_shared>
<id type="integer">1</id>
<location id="0">
<drive_type type="integer">1</drive_type>
<pathname>
<absolute type="string">C:\Virtual_Machines\CIT\CIT.vhd</absolute>
<relative type="string">.\CIT.vhd</relative>
</pathname>
<undo_pathname>
<absolute type="string">C:\Virtual_Machines\CIT\VirtualPCUndo_CIT_1_0_0_21293702102005.vud</absolute>
<relative type="string">.\VirtualPCUndo_CIT_1_0_0_21293702102005.vud</relative>
</undo_pathname>
</location>
</scsi_controller>
<scsi_controller id="1">
<adapter_scsi_id type="integer">7</adapter_scsi_id>
<adapter_shared type="boolean">false</adapter_shared>
</scsi_controller>
<scsi_controller id="2">
<adapter_scsi_id type="integer">7</adapter_scsi_id>
<adapter_shared type="boolean">false</adapter_shared>
</scsi_controller>
<scsi_controller id="3">
<adapter_scsi_id type="integer">7</adapter_scsi_id>
<adapter_shared type="boolean">false</adapter_shared>
</scsi_controller>
</scsi_adapter>

re: How-to boost Microsoft Virtual Server 2005 Guest Performance

Aaron Foster — Fri, 11 Feb 2005 05:53:00 GMT

OH yeah I forgot, I also see a disk connected under ID0, LUN0 during the bios post also.

re: How-to boost Microsoft Virtual Server 2005 Guest Performance

John Howard [MSFT] — Fri, 11 Feb 2005 16:54:00 GMT

Aaron

I should have posted the results of an email chain between myself and Adam back to this thread. If there is more than one SCSI adapter installed in the guest configuration, you need to keep with the multi configuration. For a single scsi adapter, boot.ini needs the scsi boot option. I'm taking this up with the product group as I'm sure this isn't right!.....

Even though your screenshot showed VS thinking there is only one adapter, the VMC file shows four controllers. If you take a copy of the VMC file (just in case) and delete out the bits I've pasted below, stick to the scsi option in boot.ini, it _should_ work. Strange also that two people have managed to get "ghost" scsi controllers in their VMC files - obviously something to watch out for.
Cheers,
John.

<scsi_controller id="1">
<adapter_scsi_id type="integer">7</adapter_scsi_id>
<adapter_shared type="boolean">false</adapter_shared>
</scsi_controller>
<scsi_controller id="2">
<adapter_scsi_id type="integer">7</adapter_scsi_id>
<adapter_shared type="boolean">false</adapter_shared>
</scsi_controller>
<scsi_controller id="3">
<adapter_scsi_id type="integer">7</adapter_scsi_id>
<adapter_shared type="boolean">false</adapter_shared>
</scsi_controller>

re: How-to boost Microsoft Virtual Server 2005 Guest Performance

Maxemilian Hilbrand — Mon, 28 Feb 2005 03:05:00 GMT

I've added a SCSI Controller and installed the drivers of Microsoft Virtual Server Additions (on a Windows 2000 virtual machine) - it might perform better than the adaptec driver. Then I've booted with the original boot.ini and the disks attached to scsi 0 and scsi 1 - it worked with multi(0)disk(0)rdisk(0)partition(1)\winnt ...

Max

re: How-to boost Microsoft Virtual Server 2005 Guest Performance

Titus Miron — Tue, 01 Mar 2005 11:39:00 GMT

I have exactly the same problem as Adam (at least the simptom is the same), but I don't have any extra scsi controller in the config file. I can also boot fine if I select the non SCSI option in the boot menu.

My configuration looks exactly as in the picture posted by Aaron and here it is the config file:
<ide_adapter>
<ide_controller id="1">
<location id="0">
<drive_type type="integer">2</drive_type>
<pathname>
<absolute type="string" />
<relative type="string" />
</pathname>
</location>
</ide_controller>
</ide_adapter>
<scsi_adapter>
<controller_count type="integer">1</controller_count>
<scsi_controller id="0">
<id type="integer">1</id>
<location id="0">
<drive_type type="integer">1</drive_type>
<pathname>
<absolute type="string">E:\vpc_images\VPCINSTALL\x.vhd</absolute>
<relative type="string">.\x.vhd</relative>
</pathname>
<undo_pathname>
<absolute type="string">E:\vpc_images\VPCINSTALL\x_1_0_0_03082803012005.vud</absolute>
<relative type="string">.\x_1_0_0_03082803012005.vud</relative>
</undo_pathname>
</location>
<adapter_scsi_id type="integer">7</adapter_scsi_id>
</scsi_controller>
</scsi_adapter>

Any ideeas?

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