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I have done both and there is no apparent performance difference (un-scientific opinion of course). From my experience I would recommend an IBMi host if you use internal disk and a VIOS host for external storage. I can say that my VIOS owned SAN storage IBMi VMs perform much better than the VIOS owned DASD IBMi VMs. Of course that is an apples/oranges comparison because the disk infrastructure is not the same.

Assuming all things equal with respect to performance, I wouldn't want to spend expensive IBMi processor to virtualize I/O when it can be done much cheaper with a PowerVM processor entitlement.

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-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Kirk Goins
Sent: Wednesday, April 17, 2013 11:46 AM
To: Midrange Systems Technical Discussion
Subject: Re: IBM i vs VIOS for Host Partition

I currently have a system running all native disk with VIOS as the host and IBM i as guest partitions. So no SAN is 'required' either way.
.


On Wed, Apr 17, 2013 at 9:42 AM, Jack Kingsley <iseriesflorida@xxxxxxxxx>wrote:

If I understand the question, believe you could get away from the
having to rely upon using storage spaces and could go back to using dedicated lpars.
This solution I believe requires SAN storage only.


On Wed, Apr 17, 2013 at 12:34 PM, Kirk Goins <kirkgoins@xxxxxxxxx> wrote:

I am curious about the Performance differences, if any, when hosting
IBM
i
on IBM i vs IBM i on VIOS. Are the 2 methods about the same? Wildly
Different?
Do I need more Memory or CPU generally speaking for one vs the other etc?

I don't need or want a discussion on what features/capabilities of
each method, but just how well the guest partitions perform. Looking
for real life experiences and any book type references..

Thanks

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Kirk
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