Download AIX 5L Performance Tools Handbook by IBM Redbooks PDF

By IBM Redbooks

ISBN-10: 0738422983

ISBN-13: 9780738422985

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 implications in lots of examples.This ebook is intended as a reference for method directors and AIX technical aid execs to allow them to use the functionality instruments successfully and interpret the outputs while examining AIX approach performance.A normal notion and advent 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 issues, together with functionality tracking API, Workload supervisor instruments, and function toolbox for AIX.

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Rotational latency is, for all practical purposes except sequential reading, a random function with values uniformly between zero and the time required for a full revolution of the disk. The average rotational latency is taken as the time of a half revolution. To determine the average latency, you must know the number of revolutions per minute (RPM) of the drive. By converting the revolutions per minutes to revolutions per second and dividing by 2, we get the average rotational latency. Transfer The data transfer time is determined by the time it takes for the requested data block to move through the read/write arm.

The function of the VMM from a performance point of view is to: Minimize the processor use and disk bandwidth resulting from paging Minimize the response degradation from paging for a process 10 AIX 5L Performance Tools Handbook Virtual memory segments can be of three types: Persistent segments Persistent segments are used to hold file data from the local filesystems. Because pages of a persistent segment have a permanent disk storage location, the VMM writes the page back to that location when the page has been changed if it can no longer be kept in memory.

2 Note that file system buffers for LVM require that the change is made before the filesystem is mounted. Chapter 1. 5 Logical Volume Manager (LVM) concepts Many modern UNIX operating systems implement the concept of a Logical Volume Manager (LVM) that can be used to logically manage the distribution of data on physical disk devices. The AIX LVM is a set of operating system commands, library subroutines, and other tools used to control physical disk resources by providing a simplified logical view of the available storage space.

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AIX 5L Performance Tools Handbook by IBM Redbooks

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