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  3. November 2017

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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