From: "Robert Comer" 

> I'm just guessing at the numbers, but I know the difference between
> emulation and running flat out natural and you just aren't going to come
> close.

I agree you need a bigger faster, better machine to run it, but the
advantages are great if it would work for you -- I'm not saying it would
work for everyone by any means.  It makes a lot of sense in the corp world
with their shrinking staff and need to cut costs, but for absolute
performance, it isn't the best, probably clustering is.

>Just the added layers from network drivers alone is going to cut your
> performance in half.

You can dedicate NIC's to VMs, so NIC performance isn't always that bad,
true, you'd share the host's NIC's for VMs that are low volume because of
resource limits, but dedicating a NIC to a high volume VM makes a lot of
sense.

>Add to that emulated disk drives and you cut it in half
> again.

Disk performance doesn't cut performance in half, a correctly set up host
and guests would have little performance problems that way.

> I have yet to see a company using a virtual machine installed OS for
> anything but testing or some really rare and specialty purpose. I've seen
> programmers use them because it allows them a good testing environment but
> other than that...

You don't get around much.   You wouldn't normally notice if some
corp were running VM stuff unless they told you they were, it'd just be
machines in a rack from the outside.  You're also forgetting that PC's have
come late to the game and they are definitely not the only game in town,
mainframes have been doing it for 20 or 30 years and even midranges are all
virtual now.

--
Bob Comer


"Geo"  wrote in message
news:4381ad5d$1{at}w3.nls.net...
> "Robert Comer"  wrote in message
> news:43814cb7{at}w3.nls.net...
>> >no way could you do 30 each of those doing 20 sites, not
>> > going to happen.
>>
>> I think you're selling it short.
>
> I'm just guessing at the numbers, but I know the difference between
> emulation and running flat out natural and you just aren't going to come
> close. Just the added layers from network drivers alone is going to cut
> your
> performance in half. Add to that emulated disk drives and you cut it in
> half
> again.
>
> I mean heck Bob, you are telling me you are going to take the engine from
> this sports car, stick it in a mineature train that weighs 20x more than
> the
> sports car, and get the same acceleration curve. Not going to happen.
>
>> You talk to that world more than I, but I talk to the corp world and
> they're
>> doing it virtual more and more -- some have been doing it for a lot of
> years
>> already...
>
> I have yet to see a company using a virtual machine installed OS for
> anything but testing or some really rare and specialty purpose. I've seen
> programmers use them because it allows them a good testing environment but
> other than that...
>
> So where do you see this being used so often and why?
>
> Geo.
>
>

--- BBBS/NT v4.01 Flag-5