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Virtual Machine creation question

Source: microsoft.public.virtualserver
Sent: 07/15/2008
From: Gunnertac
Message:

I was setting up my 2nd virtual machine when I noticed there is an option to
tell VS what bus type the virtual disk was - IDE or SCSI. My virtual drives
are on a SCSI array but I see that IDE is selected by default. I didn't
notice this when setting up my first Virtual Machine so I can only assume IDE
was selected when I assigned the Virtual Drives to it. I don't see anywhere
to change/edit that selection and am unsure of the ramifications. Are the two
drives I assigned using the IDE bus setting going to run slower as a result
of this or should I not be concerned? I would rather scratch the whole thing
now before I get much further if that setting makes a difference. Everything
seems to be working OK. TIA
--
Tim

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Related Messages

Re: Virtual Machine creation question

Sent: 07/15/2008
From: Steve Jain <(email address - cut out)>
Message:

On Tue, 15 Jul 2008 15:27:56 -0700, Gunnertac
<(email address - cut out)> wrote:

This has no relation to what is on your host computer.

IDE is the default, it provides better performance without the VM
Additions.

SCSI was added to VS to break the 127GB IDE barrier, allow more than 3
HDs to be added to a VM and for clustering.

You can reassign and IDE VHD to a SCSI controller if you want, but
unless you need one of the previous reasons, there's not much reason
to.

--
Cheers,
Steve Jain, Virtual Machine MVP
http://vpc.essjae.com/
I do not work for Microsoft.

Show quoted text

>I was setting up my 2nd virtual machine when I noticed there is an option to
>tell VS what bus type the virtual disk was - IDE or SCSI. My virtual drives
>are on a SCSI array but I see that IDE is selected by default. I didn't
>notice this when setting up my first Virtual Machine so I can only assume IDE
>was selected when I assigned the Virtual Drives to it. I don't see anywhere
>to change/edit that selection and am unsure of the ramifications. Are the two
>drives I assigned using the IDE bus setting going to run slower as a result
>of this or should I not be concerned? I would rather scratch the whole thing
>now before I get much further if that setting makes a difference. Everything
>seems to be working OK. TIA

Re: Virtual Machine creation question

Sent: 07/16/2008
From: Gunnertac
Message:

Thanks much.
--
Tim

"Steve Jain" wrote:

Show quoted text

> On Tue, 15 Jul 2008 15:27:56 -0700, Gunnertac
> <(email address - cut out)> wrote:
>
> >I was setting up my 2nd virtual machine when I noticed there is an option to
> >tell VS what bus type the virtual disk was - IDE or SCSI. My virtual drives
> >are on a SCSI array but I see that IDE is selected by default. I didn't
> >notice this when setting up my first Virtual Machine so I can only assume IDE
> >was selected when I assigned the Virtual Drives to it. I don't see anywhere
> >to change/edit that selection and am unsure of the ramifications. Are the two
> >drives I assigned using the IDE bus setting going to run slower as a result
> >of this or should I not be concerned? I would rather scratch the whole thing
> >now before I get much further if that setting makes a difference. Everything
> >seems to be working OK. TIA
>
> This has no relation to what is on your host computer.
>
> IDE is the default, it provides better performance without the VM
> Additions.
>
> SCSI was added to VS to break the 127GB IDE barrier, allow more than 3
> HDs to be added to a VM and for clustering.
>
> You can reassign and IDE VHD to a SCSI controller if you want, but
> unless you need one of the previous reasons, there's not much reason
> to.
>
> --
> Cheers,
> Steve Jain, Virtual Machine MVP
> http://vpc.essjae.com/
> I do not work for Microsoft.
>

Re: Virtual Machine creation question

Sent: 07/16/2008
From: "ricky chan" <(email address - cut out)>
Message:

Also, there will be no speed difference if I choose SCCI rather than IDE?

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

Show quoted text

> On Tue, 15 Jul 2008 15:27:56 -0700, Gunnertac
> <(email address - cut out)> wrote:
>
>>I was setting up my 2nd virtual machine when I noticed there is an option
>>to
>>tell VS what bus type the virtual disk was - IDE or SCSI. My virtual
>>drives
>>are on a SCSI array but I see that IDE is selected by default. I didn't
>>notice this when setting up my first Virtual Machine so I can only assume
>>IDE
>>was selected when I assigned the Virtual Drives to it. I don't see
>>anywhere
>>to change/edit that selection and am unsure of the ramifications. Are the
>>two
>>drives I assigned using the IDE bus setting going to run slower as a
>>result
>>of this or should I not be concerned? I would rather scratch the whole
>>thing
>>now before I get much further if that setting makes a difference.
>>Everything
>>seems to be working OK. TIA
>
> This has no relation to what is on your host computer.
>
> IDE is the default, it provides better performance without the VM
> Additions.
>
> SCSI was added to VS to break the 127GB IDE barrier, allow more than 3
> HDs to be added to a VM and for clustering.
>
> You can reassign and IDE VHD to a SCSI controller if you want, but
> unless you need one of the previous reasons, there's not much reason
> to.
>
> --
> Cheers,
> Steve Jain, Virtual Machine MVP
> http://vpc.essjae.com/
> I do not work for Microsoft.

Re: Virtual Machine creation question

Sent: 07/16/2008
From: Steve Jain <(email address - cut out)>
Message:

On Wed, 16 Jul 2008 10:01:30 -0400, "ricky chan" <(email address - cut out)>
wrote:

This was what I was looking for earlier:
http://blogs.msdn.com/virtual_pc_guy/archive/2006/02/06/525487.aspx

"*Our emulated IDE can only support 4 disks, while our emulated SCSI
supports up to 28 disks

* Our emulated IDE can only support up to 128GB disks, while our
emulated SCSI can support up to 2TB disks

* Our emulated IDE controller has a higher level of driver support for
various operating systems than our emulated SCSI controller

The final thing to consider is performance - and this is a bit tricky.
Contrary to common sense, the performance of our emulated SCSI
controller is slower than that of our emulated IDE controller. The
reason for this is that the SCSI controller is a lot more complicated
to emulate than the IDE controller. Now - this changes once you have
Virtual Machine Additions installed. As part of Virtual Machine
Additions we install an accelerated SCSI driver. Once this driver is
installed the performance of our emulated SCSI controller is
significantly faster than our emulated IDE controller.

So with all of this in mind, my recommendation is this:

If you are running Windows NT, 2000, XP, 2003 with Virtual Machine
Additions installed; use SCSI.
If you are running any other configuration; use IDE unless you
specifically use more than 4 disks, or larger than 128gb disks"

--
Cheers,
Steve Jain, Virtual Machine MVP
http://vpc.essjae.com/
I do not work for Microsoft.

Show quoted text

>Also, there will be no speed difference if I choose SCCI rather than IDE?
>

Re: Virtual Machine creation question

Sent: 07/16/2008
From: "ricky chan" <(email address - cut out)>
Message:

Thanks Steve,

Also, I submit another post with subject: stuck at Connected [x.x.x.x]: Valid BMCP message received at

Please advise.

Thanks
Ricky

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

Thanks Steve,

Also, I submit another post with =
subject: =20
stuck at Connected [x.x.x.x]: Valid BMCP message received at =

Please advise.

Thanks
Ricky

"Steve Jain" (email address - cut out)> wrote in=20
message news:(email address - cut out)...> =
On Wed, 16 Jul=20
2008 10:01:30 -0400, "ricky chan" (email address - cut out)>>=20
wrote:> >>Also, there will be no speed difference if I =
choose=20
SCCI rather than IDE?>>> > This was what I was =
looking=20
for earlier:> http://blogs.msdn.com/virtual_pc_guy/archive/2006/02/06/525487.a=
spx> > "*Our emulated IDE can only support =
4 disks,=20
while our emulated SCSI> supports up to 28 disks > =
emulated IDE can only support up to 128GB disks, while our> =
emulated SCSI=20
can support up to 2TB disks > > * Our emulated IDE =
controller has=20
a higher level of driver support for> various operating systems =
than our=20
emulated SCSI controller> > The final thing to consider is =

performance - and this is a bit tricky.> Contrary to common =
sense, the=20
performance of our emulated SCSI> controller is slower than that =
of our=20
emulated IDE controller. The> reason for this is that the =
SCSI=20
controller is a lot more complicated> to emulate than the IDE=20
controller. Now - this changes once you have> Virtual =
Machine=20
Additions installed. As part of Virtual Machine> Additions =
we=20
install an accelerated SCSI driver. Once this driver is> =
installed=20
the performance of our emulated SCSI controller is> significantly =
faster=20
than our emulated IDE controller.> > So with all of this =
in mind,=20
my recommendation is this:> > If you are running Windows =
NT, 2000,=20
XP, 2003 with Virtual Machine> Additions installed; use SCSI. =
you are running any other configuration; use IDE unless you> =
specifically=20
use more than 4 disks, or larger than 128gb disks"> > -- =
Cheers,> Steve Jain, Virtual Machine MVP > http://vpc.essjae.com/> I do=20
not work for Microsoft.

Show quoted text

> On Wed, 16 Jul 2008 10:01:30 -0400, "ricky chan" <(email address - cut out)>
> wrote:
>
>>Also, there will be no speed difference if I choose SCCI rather than IDE?
>>
>
> This was what I was looking for earlier:
> http://blogs.msdn.com/virtual_pc_guy/archive/2006/02/06/525487.aspx
>
> "*Our emulated IDE can only support 4 disks, while our emulated SCSI
> supports up to 28 disks
>
> * Our emulated IDE can only support up to 128GB disks, while our
> emulated SCSI can support up to 2TB disks
>
> * Our emulated IDE controller has a higher level of driver support for
> various operating systems than our emulated SCSI controller
>
> The final thing to consider is performance - and this is a bit tricky.
> Contrary to common sense, the performance of our emulated SCSI
> controller is slower than that of our emulated IDE controller. The
> reason for this is that the SCSI controller is a lot more complicated
> to emulate than the IDE controller. Now - this changes once you have
> Virtual Machine Additions installed. As part of Virtual Machine
> Additions we install an accelerated SCSI driver. Once this driver is
> installed the performance of our emulated SCSI controller is
> significantly faster than our emulated IDE controller.
>
> So with all of this in mind, my recommendation is this:
>
> If you are running Windows NT, 2000, XP, 2003 with Virtual Machine
> Additions installed; use SCSI.
> If you are running any other configuration; use IDE unless you
> specifically use more than 4 disks, or larger than 128gb disks"
>
> --
> Cheers,
> Steve Jain, Virtual Machine MVP
> http://vpc.essjae.com/
> I do not work for Microsoft.
> * Our=20
> If=20
>=20

Re: Virtual Machine creation question

Sent: 07/17/2008
From: "Bruce Sanderson" <(email address - cut out)am>
Message:

See also:
http://blogs.technet.com/jhoward/archive/2007/10/04/boot-from-scsi-in-virtual-server-vs-boot-from-ide-in-windows-server-virtualization.aspx,which explains the difference between IDE vs SCSI for Virtual Server vsHyper-V.If you are going to use SCSI virtual disks with Virtual Server, you mightwant to install the "Shunt Driver" (C:\Program Files\Microsoft VirtualServer\Virtual Machine Additions\SCSI Shunt Driver.vfd) during guest OSinstallation - seehttp://blogs.msdn.com/virtual_pc_guy/archive/2005/04/26/412411.aspxandhttp://www.petri.co.il/installing-virtual-scsi-controller-driver-for-virtual-server-2005-on-windows-server-2008.htm--Bruce Sandersonhttp://members.shaw.ca/bsandersIt is perfectly useless to know the right answer to the wrong question."Steve Jain" <(email address - cut out)> wrote in messagenews:(email address - cut out)...> On Wed, 16 Jul 2008 10:01:30 -0400, "ricky chan" <(email address - cut out)>> wrote:>>>Also, there will be no speed difference if I choose SCCI rather than IDE?>>>> This was what I was looking for earlier:> http://blogs.msdn.com/virtual_pc_guy/archive/2006/02/06/525487.aspx>> "*Our emulated IDE can only support 4 disks, while our emulated SCSI> supports up to 28 disks>> * Our emulated IDE can only support up to 128GB disks, while our> emulated SCSI can support up to 2TB disks>> * Our emulated IDE controller has a higher level of driver support for> various operating systems than our emulated SCSI controller>> The final thing to consider is performance - and this is a bit tricky.> Contrary to common sense, the performance of our emulated SCSI> controller is slower than that of our emulated IDE controller. The> reason for this is that the SCSI controller is a lot more complicated> to emulate than the IDE controller. Now - this changes once you have> Virtual Machine Additions installed. As part of Virtual Machine> Additions we install an accelerated SCSI driver. Once this driver is> installed the performance of our emulated SCSI controller is> significantly faster than our emulated IDE controller.>> So with all of this in mind, my recommendation is this:>> If you are running Windows NT, 2000, XP, 2003 with Virtual Machine> Additions installed; use SCSI.> If you are running any other configuration; use IDE unless you> specifically use more than 4 disks, or larger than 128gb disks">> --> Cheers,> Steve Jain, Virtual Machine MVP> http://vpc.essjae.com/> I do not work for Microsoft.

Re: Virtual Machine creation question

Sent: 07/17/2008
From: "Bruce Sanderson" <(email address - cut out)am>
Message:

For an unknown mysterious reason, all line breaks were removed from my post,
so here it is again, hopefully, easier to read!

See also:
http://blogs.technet.com/jhoward/archive/2007/10/04/boot-from-scsi-in-virtual-server-vs-boot-from-ide-in-windows-server-virtualization.aspx,which
explains the difference between IDE vs SCSI for Virtual Server vsHyper-V.

If you are going to use SCSI virtual disks with Virtual Server, you
mightwant to install the "Shunt Driver" (C:\Program Files\Microsoft
VirtualServer\Virtual Machine Additions\SCSI Shunt Driver.vfd) during guest
OSinstallation - see

http://blogs.msdn.com/virtual_pc_guy/archive/2005/04/26/412411.aspxandhttp://www.petri.co.il/installing-virtual-scsi-controller-driver-for-virtual-server-2005-on-windows-server-2008.htm

--
Bruce Sanderson
http://members.shaw.ca/bsanders

It is perfectly useless to know the right answer to the wrong question.

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

Show quoted text

Post Reply | This is Spam! | Mark as Spam

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