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Re: New Power8 Disk Perf Issues



fixed

Short answer is No. I installed VIOS using Defaults, built Raid6 across 20
300GB drives.
used the HMC to Create and Assign vSCSI drives ( 20 x 100GB ). Installed
LIC,
Added the other 19 vSCSI to the ASP ans tried to install 7.1 from DVD.
TOPAS showed the hdisk virtually running at 100% Busy. I will review the
url you sent.

BTW basically spent 6+ hours on the phone with support HW, SW collecting
this and that. Total waste of the day, got no where finally wiped VIOS and
started doen the IBMi on IBMi path. After long waits for RAID6 to built and
then the vSCSI builds and adding to the ASP I am just now installing from a
Save 21 and it is running fine.



On Sat, Aug 23, 2014 at 10:34 AM, Sue Baker <sue.baker@xxxxxxxxxx> wrote:


Did you follow the directions at

https://www.ibm.com/developerworks/community/wikis/home?lang=en#!/wiki/IBM%20i%20Technology%20Updates/page/SAS%20Adapter%20Performance%20Boost%20with%20VIOS

This is the only way to get reasonable performance when
using the POWER8 high function backplane or features 5913, ESA3, & EJ0L
adapters.

I suspect on POWER7 you were using either its CEC high function backplane
or the feature 5903 adapters.

Kirk Goins <kirkgoins@xxxxxxxxx> wrote on Fri, 22 Aug 2014
19:57:51 GMT:

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.





--
Sue
IBM Americas Advanced Technical Sales Support (ATS) Power Systems
Rochester, MN
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