What is the method for configuring multipath in Linux?
The method to configure Multipath in a Linux system is as follows:
- Confirm that the system has installed the multipath software package. You can use the following command to check:
- Please install multipath-tools using the following command: sudo apt-get install multipath-tools
- Edit the /etc/multipath.conf file, which stores the configuration information for multipath. You can open this file using a text editor like vi.
- Open the file multipath.conf in the directory /etc using the text editor Vi with superuser privileges.
- In the “multipaths” section, multiple path configurations are defined. Each multiple path configuration includes the following key elements:
- Alias: A nickname for multi-path devices.
- wwid: The unique identifier of a multipath device.
- The path grouping policy can be set to either failover or multibus.
- path_selector: The strategy for choosing paths, with options of round-robin or queue-length.
- Failback refers to the recovery strategy for failures, with options of immediate or manual recovery.
- rr_weight: Weighted Round Robin, used to specify the weight of each path when the path selection strategy is round robin.
- Example configuration:
- Define multiple paths for failover with the alias “mymultipath” using a round-robin path selector and immediate failback.
- Save and close the /etc/multipath.conf file.
- Reload the multipath configuration.
- Please restart the multipathd service using sudo systemctl.
- Use the following command to view multi-path devices:
- Please execute “sudo multipath -ll”
- You can see the multipath devices that have already been configured.
Before configuring multiple paths, it is important to verify that the hardware device supports multiple paths and that the multiple path functionality has been enabled through the device driver. The specific steps and configurations may vary depending on the hardware and operating system versions.
