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RE: New Power8 Disk Perf Issues



fixed

Jose,

We know that P8 will use internal storage, except, as I understand it, if
you have the back plane split so you can run dual VIO Servers. Then you
must use external storage. So it's about half right. Even then I think you
might get away with internal storage but it would be A) slow and B) very
limiting so certainly not recommended.

--
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: Monday, August 25, 2014 12:56 PM
To: Midrange Systems Technical Discussion
Subject: Re: New Power8 Disk Perf Issues

In last week's Storage Portfolio TopGun they claimed that Power8 didn't
allow IBM i to use internal storage anymore, only SAN. That sounded wrong
since at least Rob had a p8 machine with internal disks, but maybe they want
to migrate everything out of the CEC?
Taking into account availability requirements i would almost always
recommend Dual VIOS with external storage if possible. A single IBM i
instance may fail but two VIOS are harder to knock. Of course if IBM somehow
implemented Dual IBM i Hosting or the like that advantage would be moot...


On Mon, Aug 25, 2014 at 10:20 AM, Jim Oberholtzer <
midrangel@xxxxxxxxxxxxxxxxx> wrote:

I was thinking the same thing.

This is getting even more into the category of "Why VIOS?" Since IBM
i can virtualize so well now the only real solid tangible benefit to
supporting yet another OS is virtualization of Tape Library devices
and to a lesser extent Ethernet. IBM i is so much easier, (for us i
guys anyway) and there are few if any real restrictions I can cite
except that of the tape library virtualization. I'll stipulate that
with NPIV disk management it a bit easier since 90% of that is done on
the SAN, and that if SAN is the storage that might be the way to go, but
with internal storage, I'm not convinced.

--
Jim Oberholtzer
Chief Technical Architect
Agile Technology Architects


-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of
DrFranken
Sent: Monday, August 25, 2014 7:52 AM
To: Midrange Systems Technical Discussion
Subject: Re: New Power8 Disk Perf Issues

Was it just me or did the whole 520 byte 'switch' parameter
description seem 'backwards' in the descriptions?? At one point I'm
thinking 'No, I don't want that' but later 'Yes I do want that!'

- Larry "DrFranken" Bolhuis

www.frankeni.com
www.iDevCloud.com
www.iInTheCloud.com

On 8/25/2014 7:37 AM, rob@xxxxxxxxx wrote:

Good article.


Rob Berendt

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