?
Solved

IBM LPAR Processor Issue (EC vs vCPU)

Posted on 2014-09-11
1
Medium Priority
?
649 Views
Last Modified: 2014-09-11
I have an LPAR and processor settings are as follows..

Available system processing units: 9.8
Available system processing units
(with releasable amount from other partitions): 9.8

Minimum Processing units : 0.1
Minimum Virtual Processors units : 1

Assigned Processing units : 1.4
Assigned Virtual Processors units : 4

Currently My CPU is pegged and on my TOPAS, I see that the ec% is 1400+ and CPU is 200% and I want to add more resources.

So here is my question :

1. Does it make sense to add more virtual processing units like increase 4 to like 8

Or

2. Does it make sense to increase the Assigned Processing Units from 1.4 to 4

So please suggest....
0
Comment
Question by:Ramu Shetty
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
1 Comment
 
LVL 68

Accepted Solution

by:
woolmilkporc earned 2000 total points
ID: 40317844
Increasing the number of VPs will not make sense, because this won't add any processing power to the LPAR (the available power will just be distributed differently).
Increasing the Entitled Capacity will actually add processing power to the LPAR, so this should be the way to go.

Please keep in mind that you must configure at least one VP per real processing unit, because one VP can be mapped to one real PU at max. So lack of VPs will lead to PUs idleing around.
Given this rule you'll further have to decide if your LPAR has to serve few, CPU-hungry threads or many, not so hungry ones. The more threads, the more VPs (up to one VP per 0.1 PU resp. one VP per 0.05 PU on Power7+).

Here is a nice article on all this:
http://www.ibmsystemsmag.com/aix/administrator/lpar/vp_entitlements/
0

Featured Post

On Demand Webinar - Networking for the Cloud Era

This webinar discusses:
-Common barriers companies experience when moving to the cloud
-How SD-WAN changes the way we look at networks
-Best practices customers should employ moving forward with cloud migration
-What happens behind the scenes of SteelConnect’s one-click button

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

This tech tip describes how to install the Solaris Operating System from a tape backup that was created using the Solaris flash archive utility. I have used this procedure on the Solaris 8 and 9 OS, and it shoudl also work well on the Solaris 10 rel…
FreeBSD on EC2 FreeBSD (https://www.freebsd.org) is a robust Unix-like operating system that has been around for many years. FreeBSD is available on Amazon EC2 through Amazon Machine Images (AMIs) provided by FreeBSD developer and security office…
Learn how to get help with Linux/Unix bash shell commands. Use help to read help documents for built in bash shell commands.: Use man to interface with the online reference manuals for shell commands.: Use man to search man pages for unknown command…
Learn how to navigate the file tree with the shell. Use pwd to print the current working directory: Use ls to list a directory's contents: Use cd to change to a new directory: Use wildcards instead of typing out long directory names: Use ../ to move…
Suggested Courses

764 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question