IBM recently published an IBM i Performance FAQ. This document is a fantastic resource on all types of performance topics. It reviews the various components of system performance, discusses benchmarking, sizing and capacity planning, monitoring, and covers the performance tools that are available on i. The document has answers to many commonly asked questions and ends with an extensive list of references.
The IBM i Performance FAQ was put together by the Systems Performance team in Rochester, drawing upon the knowledge of leading experts on IBM i performance from the development team, the support center and Lab Services.
All IBM i administrators should read this document and it should be used as an initial reference for any performance-related questions. It is the single best place to start for anything related to performance topics on i.
The Performance management on IBM i Web page has also been updated to include a link to this performance FAQ. If you’re not familiar with the performance management site, it’s another great resource for information on performance topics.
Finally, the End-to-End Performance Management on IBM i Redbooks publication is a good reference for IBM i performance tools. Although it was written based upon IBM i 6.1 capabilities in 2009, the content of that Redbooks document remains current.
Would like more information on disk performance. I have 4 LPARs where LPAR 1 & 2 are not I/O intensive. Can I configure 2*5805 for LPAR 1&2 and 2*5913 for LPAR 3&4?
1. how is this done or implemented?
2. Would this effect the overall performance of the machine knowing that IBM i uses single level storage.
Posted by: Warren Allen | March 04, 2013 at 11:32 PM
HI Warren,
Adapter pairs may not be split between IBM i LPARs. In other words, a single IBM i LPAR must have both adapters that make up the pair allocated to it in order to be in a supported configuration.
Dawn
Posted by: Dawn May | March 07, 2013 at 07:51 AM
Hi Dawn,
Each LPAR will have it's own pair of adapter. My concern is that I am configuring 2 different adapter which have different cache size. Would that effect the overall performance of the machine?
Do I create different ASP for the different LPARs?
Posted by: Warren Allen | March 08, 2013 at 12:47 AM
I will be contacting Warren directly offline as this discussion is moving off-topic from the blog post.
Dawn
Posted by: Dawn May | March 20, 2013 at 10:02 AM