How to check the I/O scheduler of a Linux system?

To view the I/O scheduler in a Linux system, you can use one of the following methods:

Using the command line: Execute the following command in the terminal to view the I/O scheduler currently being used:

　cat /sys/block/{device}/queue/scheduler

　Where {device} is the name of the device you want to view, for example, sda is the first hard disk.

For example, to view the scheduler of the sda ​​hard disk:

　cat /sys/block/sda/queue/scheduler

Use tools: You can use some tools to view the I/O scheduler of all devices in the system, such as lsblk or blkid. For example:

　lsblk -o NAME,TYPE,SCHEDULER

This will list the names, types, and schedulers of all block devices in the system.

View the kernel configuration: You can determine the system's default I/O scheduler by viewing the kernel configuration file. Kernel configuration information can usually be found in the config-*
files in the /boot directory. You can search for the keyword CONFIG_DEFAULT_IOSCHED to find the default I/O scheduler.

Please note that changing the I/O scheduler may require root privileges. Make sure you understand your current system environment and needs before changing the scheduler to avoid potential performance issues.

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