sysstat：Linux监控工具包

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“The sysstat utilities are a collection of performance monitoring tools for Linux. These include sar, sadf, mpstat, iostat, tapestat, pidstat, cifsiostat  and sa tools.”

sysstat工具包包含：

监控程序：

• iostat reports CPU statistics and input/output statistics for devices, partitions and network filesystems. **
• mpstat reports individual or combined processor related statistics.
• pidstat reports statistics for Linux tasks (processes) : I/O, CPU, memory, etc. **
• tapestat reports statistics for tape drives connected to the system.
• cifsiostat reports CIFS statistics.
• sysstat is just a manual page for sysstat configuration file, giving the meaning of environment variables used by sysstat commands.
• nfsiostat The nfsiostat command displays NFS client per-mount statisitics.
• vmstat reports information about processes, memory, paging, block IO,traps, disks and cpu activity.  **

统计、记录工具：

• sar collects, reports and saves system activity information (CPU, memory, disks, interrupts, network interfaces, TTY, kernel tables,etc.)  **   /var/log/sa/
• sadc is the system activity data collector, used as a backend for sar.
• sa1 collects and stores binary data in the system activity daily data file. It is a front end to sadc designed to be run from cron or systemd. 
• sa2 writes a summarized daily activity report. It is a front end to sar designed to be run from cron or systemd. 
• sadf displays data collected by sar in multiple formats (CSV, XML, JSON, etc.) and can be used for data exchange with other programs. This command can also be used to draw graphs for the various activities collected by sar using SVG (Scalable Vector Graphics) format.

下载：

yum -y install sysstat