RE: i hosting i question

I might also offer that if you are architecting a new solution and more than
two hosted partitions are planned, you should really look into using VIOS to
perform the virtualization. VIOS offers several advantages to IBM i hosting
IBM i, chief among them are you're not burning IBM i licensing to perform
the hosting. Virtualizing fibre attached tape is a breeze as well.

If you use the vSCSI drives with local storage there are a couple of tuning
things you need to do in VIOS for I/O blocking etc, but that is all well
documented.

Geesh, I never thought I would ever post something nice about VIOS but, then
again, it's true. We use it quite a bit.


--
Jim Oberholtzer
Agile Technology Architects

-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of
Steinmetz, Paul
Sent: Wednesday, November 22, 2017 8:55 AM
To: 'Midrange Systems Technical Discussion'
Subject: RE: i hosting i question

+1
I/O hosting much improved with SSD drives.
I have a Production SSD LPAR hosting only some I/O to R&D LPAR for some
improved R&D performance, no issues.
The R&D LPAR has its own dedicated CPU and memory.

Paul

-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Jim
Oberholtzer
Sent: Wednesday, November 22, 2017 9:35 AM
To: 'Midrange Systems Technical Discussion'
Subject: RE: i hosting i question

There is some truth to that statement, but of course, "it depends".

Usually it's because the host system I/O becomes the bottleneck with large
partitions. We have several 7TB and 8TB partitions at customers that are
hosted, but we have carefully monitored the I/O on the host system and
ensured that it has plenty of memory and CPU. Watch disk unit busy
percentage on the host system. If that gets too high (>20%) then all the
virtualized systems suffer.

Remember CPU is needed to manage the virtualization and most folks get too
skinny on that part. Don't worry that the percent of CPU is near zero most
of the time, the virtualization CPU usage does not really show on the
WRKSYSSTS display. We use WRYSYSACT to find the virtualization jobs and
monitor them.


--
Jim Oberholtzer
Agile Technology Architects

-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Tom
Duncan
Sent: Tuesday, November 21, 2017 4:06 PM
To: Midrange Systems Technical Discussion
Subject: i hosting i question

I just had someone tell me that IBM does not recommend using i hosting i if
the amount of disk is over 3 or 4 Tbytes for performance reasons. Is anyone
aware of or even heard of this ?
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