[Linux] Bash iostat Uso: Monitor system input/output device loading

Overview

The iostat command is a useful tool for monitoring system input/output device loading in Linux. It provides statistics on CPU utilization and input/output operations for devices and partitions, helping users identify performance bottlenecks.

Usage

The basic syntax of the iostat command is as follows:

iostat [options] [arguments]

Common Options

• -c: Display CPU usage statistics.
• -d: Show device utilization statistics.
• -x: Provide extended statistics, including more detailed metrics for each device.
• -m: Display statistics in megabytes per second.
• -t: Include a timestamp in the output.

Common Examples

1. Basic CPU and Device Statistics

   iostat
   

2. Display CPU Usage Only

   iostat -c
   

3. Show Device Statistics with Extended Information

   iostat -dx
   

4. Monitor I/O Statistics in Megabytes

   iostat -m
   

5. Include Timestamps in the Output

   iostat -t
   

6. Continuous Monitoring Every 5 Seconds

   iostat 5
   

Tips

• Use the -x option for detailed device statistics to better understand performance issues.
• Combine iostat with other monitoring tools like vmstat or top for a comprehensive view of system performance.
• Regularly monitor I/O statistics during peak usage times to identify potential bottlenecks and optimize performance.