Is there a guide somewhere on setting this up? And maybe a best practices? We are working on getting our next box now. Our dev partition which is 2 mirrored 283 gig drives hosted on vios (and slow as hell!) is going to become about 500 gigs in an i on i situation. I'd like to optimize that disk speed, as that is the only really bad thing about that partition now.
-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Jim Oberholtzer
Sent: Wednesday, December 19, 2018 8:53 AM
To: 'Midrange Systems Technical Discussion'
Subject: RE: NWSD and NWSSTG recommendations
200GB drives in the quantity you are proposing should work well.
The limits on the number of NWSSTG units a NWSD instance would support was
16 and was raised later, I'm not sure what the limit is now, but I've always found performance is best when we put no more than 12-13 drives per NWSD instance. It also gives you the ability to add drives later and spread them out vs. putting all the new drives in one place.
Watch memory in the machine pool and *BASE, carefully. That's where quite a bit of this virtualization is done, you'll be surprised at how much memory it takes. Don't short it.
--
Jim Oberholtzer
Agile Technology Architects
-----Original Message-----
From: MIDRANGE-L <midrange-l-bounces@xxxxxxxxxxxx> On Behalf Of Steinmetz, Paul
Sent: Wednesday, December 19, 2018 8:38 AM
To: 'Midrange Systems Technical Discussion' <midrange-l@xxxxxxxxxxxx>
Subject: NWSD and NWSSTG recommendations
New P9, 9009-42A, V7R3.
I will be virtualizing about 20 TB of SSD to client R&D LPAR.
The entire R&D LPAR will virtualized.
My plan was 10 NWSD each consisting of 5 200gb NWSSTG.
This would give me 50 arms, each about 200gb each, one would be the load source.
Some rules and guidelines from previous posts.
More arms the better.
For performance - at least 6 NWSSTG per system, max 16 (32?) NWSSTG per NWSD Consistently sized and at least 70GB ??
Goal is for optimal performance on both the host and the client LPARs.
1) Does anyone have any history on the optimal number of NWSD?
2) Can too many NWSD cause a performance issue.
Also, I will be repeating this process for 2 additional sandbox LPARS, each about 5 TB.
When complete, host LPAR will have about 20 NWSD.
Any thoughts from the group?
Thank You
_____
Paul Steinmetz
IBM i Systems Administrator
Pencor Services, Inc.
462 Delaware Ave
Palmerton Pa 18071
610-826-9117 work
610-826-9188 fax
610-349-0913 cell
610-377-6012 home
psteinmetz@xxxxxxxxxx
http://www.pencor.com/
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