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 process directors and AIX technical aid execs to allow them to use the functionality instruments successfully and interpret the outputs whilst interpreting AIX procedure performance.A basic idea 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 publication 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 issues, together with functionality tracking API, Workload supervisor instruments, and function toolbox for AIX.

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Chapter 1. Introduction to AIX performance monitoring and tuning 29 The knowledge of the network topology used is necessary to understand and detect possible performance bottlenecks on the network. This includes information about the routers and gateways used, the Maximum Transfer Unit (MTU) used on the network path between the systems, and the current load on the networks used. This information should be well documented, and access to these documents needs to be guaranteed at any time. AIX offers a wide range of tools to monitor networks, network adapters, network interfaces, and system resources used by the network software.

16 AIX 5L Performance Tools Handbook Application workload type The I/O workload characteristics of the application should be fairly well understood prior to implementing the disk subsystem. Different workload types most often require different disk subsystem configuration in order to provide acceptable I/O performance. Required disk subsystem throughput The I/O performance requirements of the application should be defined up front, as they will play a large part in dictating both the physical and logical configuration of the disk subsystem.

26 AIX 5L Performance Tools Handbook update will require a repositioning of the disk write head to update the MWC record, it can cause a performance problem. When the volume group is varied back on-line after a system crash, this information is used to make the logical partitions consistent again. Passive MWC is used for the mirrored logical volume but the LVDD will not keep the MWC record synchronized on disk. Synchronization of the physical partitions that belong to the mirrored logical partition will be updated after IPL.

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