Re: New Power8 Disk Perf Issues

Performance of IBM i, guested from internal disk, on VIOS was awful,
unusable, pathetic.
We have a dedicated IBM i 'host' guesting disk to other lpars of IBM i and
AIX. MUCH better!
The only way to fly.
Guesting disk from VIOS should be reserved for external disk.


Rob Berendt
--
IBM Certified System Administrator - IBM i 6.1
Group Dekko
Dept 1600
Mail to: 2505 Dekko Drive
Garrett, IN 46738
Ship to: Dock 108
6928N 400E
Kendallville, IN 46755
http://www.dekko.com





From: Kirk Goins <kirkgoins@xxxxxxxxx>
To: Midrange-L <midrange-l@xxxxxxxxxxxx>
Date: 08/22/2014 03:58 PM
Subject: New Power8 Disk Perf Issues
Sent by: "MIDRANGE-L" <midrange-l-bounces@xxxxxxxxxxxx>



Brand New 6core 128GB Mem
18 disk bay backplane with High Cache Internal Controller
EXP24S with 20 300GB drives
VIOS with3cores an d16GB Mem
Created 20 100GB vSCSI Drives for IBM i ( sees 95.5GB each )
10 each on 2 vSCSi Controllers

IBM i LIC install 8-10min ( normal is 3 to 5min )
IBM i Group1 DVD just took over 3.5hrs to install

VIOS TOPAS shows Disk at or near 100% Busy
Spent almost 3hrs on the phone with IBM and best thay could do
is have me collect snap and a perf collection and send it. They tell
that from VIOS or AIX they can't tell if the Disk Cache is working or not.
Best I can Tell from smit is it look like the controllers are working, but
I can't get IBM to help look and tell if what I see is right , wrong or ??

Any Help or ideas would be of great in trying to diagnose this problem.


--
Kirk
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