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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