RE: VIOS iSCSI vs. Fibre Channel with NPIV

In the case of VIOS hosted storage you are correct much of the improvement
in performance was not having the internal DASD virtualized by VIOS.

That said, when you use IBM i as the host, I have not seen the same type of
performance degradation in the hosted storage, it performs almost the same
as dedicated storage. VIOS is just not that good at I/O so pushing the
storage off to the SAN fixes that problem.

--
Jim Oberholtzer
Chief Technical Architect
Agile Technology Architects


-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of
Roberto José Etcheverry Romero
Sent: Friday, November 14, 2014 10:29 AM
To: Midrange Systems Technical Discussion
Subject: Re: VIOS iSCSI vs. Fibre Channel with NPIV

Jim,

In this case i would say that the performance improvement wasn't due to the
vSCSI to NPIV transition but from internal disks to external. External disks
trump VIOS hosted disk most of the time. Had you done it without NPIV (a
hassle, creating each vhost, pdisk, etc) the performance should have been
similar (NPIV IS better anyways, more simple too).
I have some clients with 4G adapters that can't use NPIV and one with 8G
adapters but directly attached to a DS3524 and performance is great even
having to go thru VIOS.

Good procedure and better to have the comments on how to go from
external-vSCSi to external-NPIV.

On Fri, Nov 14, 2014 at 1:00 PM, Patrick.Bingham@xxxxxxxxxxxxx <
Patrick.Bingham@xxxxxxxxxxxxx> wrote:

From the HMC if you go to the operations section of the VIOS partition
it will allow you to run any command. I still like to do things via
ssh but it's hard to break out of old habits.



-----Original Message-----
From: Jim Oberholtzer [mailto:midrangel@xxxxxxxxxxxxxxxxx]
Sent: Friday, November 14, 2014 8:27 AM
To: 'Midrange Systems Technical Discussion'
Subject: RE: VIOS iSCSI vs. Fibre Channel with NPIV

Sue,

-- IF -- all the storage was on the V3700 to start with yes I could
have, however I had to move it from internal storage to the V3700, so it
physically had to move. The most important thing was the only down time
was to copy the load source over. Converting to external storage just
got easy in a VIOS environment.

I have to admit, VIOS is starting to win me over particularly with the
management mainly in the HMC code. The only command I had to run on
the VIOS side was CFGDEV then a command or two to verify the Fibre
logged in (it did).

--
Jim Oberholtzer
Chief Technical Architect
Agile Technology Architects


-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of
Sue Baker
Sent: Thursday, November 13, 2014 5:57 PM
To: midrange-l@xxxxxxxxxxxx
Subject: Re: VIOS iSCSI vs. Fibre Channel with NPIV

"Jim Oberholtzer" <midrangel@xxxxxxxxxxxxxxxxx> wrote on Thu, 13 Nov
2014
21:41:59 GMT:

I just converted an LPAR from using Virtual SCSI under VIOS to a
Fibre Channel with NPIV. Steps were simple:

Jim, you did it the hardware .... You could have

1) create VFC ports
2) shutdown
3) add VFC ports to host
4) map the LUNs to the VFC host
5) IPL

No load source migration. No add/remove.
--
Sue
IBM Americas Advanced Technical Sales Support (ATS) Power Systems
Rochester, MN
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