AIX 5L Performance Tools Handbook by IBM Redbooks

By IBM Redbooks

This IBM Redbook takes an insightful examine the functionality tracking and tuning instruments which are supplied with AIX 5L. It discusses using the instruments in addition to the translation of the consequences in lots of examples.This booklet is intended as a reference for procedure directors and AIX technical aid execs to allow them to use the functionality instruments successfully and interpret the outputs whilst interpreting AIX process performance.A common inspiration and creation to the instruments is gifted to introduce the reader to the method of AIX functionality analysis.The person functionality instruments mentioned during this booklet fall into those categories:- Multi-resource tracking and tuning instruments- CPU-related functionality instruments- Memory-related functionality instruments- Disk I/O-related functionality instruments- Network-related functionality instruments- functionality tracing instruments- extra functionality themes, together with functionality tracking API, Workload supervisor instruments, and function toolbox for AIX.

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24 AIX 5L Performance Tools Handbook In order to determine the data placement strategy for a mirrored logical volume, the settings for both the Range and Strict options must be carefully considered. As an example, consider a mirrored logical volume with range setting of minimum and a strict setting of yes. The LVM would attempt to place all of the physical partitions associated with the primary copy on one physical disk, with the mirrors residing on either one or two additional disks, depending on the number of copies of the logical volume (2 or 3).

There are two types of page fault, a new page fault, where the page is referenced for the first time and a repage fault, where pages have already been paged out before. The stealer keeps track of the pages paged out, by using a history buffer that contains the IDs of the most recently paged out pages. The history buffer also serves the purpose of maintaining a balance between pages of persistent segments and pages of working segments that get paged out to disk. The size of the history buffer is dependent on the amount of memory in the system; a memory size of 512 MB requires a 128 KB history buffer.

3 Disk I/O performance A lot of attention is required when the disk subsystem is designed and implemented. 1 Initial advice We recommend that you do not make any changes to the default disk I/O parameters until you have had experience with the actual workload. Note, however, that you should always monitor the I/O workload and will very probably need to balance the physical and logical volume layout after runtime experience. Chapter 1. Introduction to AIX performance monitoring and tuning 15 There are two performance limiting aspects of the disk I/O subsystem that need to be considered: Physical limitations Logical limitations A poorly performing disk I/O subsystem will usually severely penalize overall system performance.

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