Introduction to using Sar under Linux

Introduction to using Sar under Linux

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Introduction

The Sar was first implemented in the Salaris UNIX system and later migrated to most of the other UNIX systems (such as AIX,HP-UX, etc.). Linux also has a French-written sysstat that implements the functionality of this tool.

Its principle is to use cron to schedule a program regularly, collect the current system performance indicators, stored in the binary file.

Installation

You can download the source code, compile your own installation, or install a binary package. RHEL system is installed by default.

Key Features

Support Features:

• Almost all of the system performance data can be collected.
• You can configure the retention time for historical data.
• Collection performance data can be exported from binary files into different format files (CSV, XML, JSON, etc.).
• Performance data can be plotted, and there are a number of third-party tools that bring their own isag.

Configuration

Modify historical Data Retention time:

vi /etc/sysconfig/sysstat # redhatvi /etc/default/sysstat   # debianHISTORY=90 # 表示保留90天的历史数据

Modify the performance data collection frequency (that is, modify cron schedule frequency), the default is 10 minutes once:

vi /etc/cron.d/sysstat

Export

Supports performance data export in various formats:

sdaf -d # CSVsadf -x # XMLsadf -j # JSON

Drawing

The drawing can use ISAG. It has a graphical interface and is very easy to use. Although the drawing is rather ugly, it is enough.

Other drawing programs that use SYSSTAT data:

• Sysstatgraph uses PHP and HTML5 Canvas technology.

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Introduction to using Sar under Linux