Vista - Virtual Machine creation question

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

On Tue, 15 Jul 2008 15:27:56 -0700, Gunnertac
<Gunnertac@xxxxxx> 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.

Thanks much.
--
Tim


"Steve Jain" wrote:

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

"Steve Jain" <noreply.-@-.essjae.com> wrote in message
news:gp9q745f2biib2qb6a1805q30coq67j667@xxxxxx

On Wed, 16 Jul 2008 10:01:30 -0400, "ricky chan" <beeloo@xxxxxx>
wrote:
This was what I was looking for earlier:
http://blogs.msdn.com/virtual_pc_guy...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.

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" <noreply.-@-.essjae.com> wrote in message news:icds749vvnq9n1vhgidmv0tgjc4hs46q5i@xxxxxx