Multipath

Install Multipath on Debian Server

by

Note: 
This installation is tested on Debian 10 (Buster) edition. It might work for other versions of Debian as well.

DMM Setup Overview

DM-Multipath includes compiled-in default settings that are suitable for common multipath configurations. Setting up DM-multipath is often a simple procedure. The basic procedure for configuring your system with DM-Multipath is as follows:

  1. Install the multipath-tools and multipath-tools-boot packages
  2. Copy an existing config file
  3. If necessary, edit the multipath.conf configuration file to modify default values and save the updated file.
  4. Start the multipath daemon

Installation of multipath:

apt update
apt install multipath-tools multipath-tools-boot
systemctl restart multipathd

On CentOS/Redhat distribution, the default configuration path is: 

Read more

Share

Add Multipath and connect to XFS system

by

Device Mapper Multipathing (DM-Multipath) is a native multipathing in Linux, Device Mapper Multipathing (DM-Multipath) can be used for Redundancy and to Improve the Performance. It aggregates or combines the multiple I/O paths between Servers and Storage, so it creates a single device at the OS Level.

For example, Lets say a server with two HBA card attached to a storage controller with single ports on each HBA cards. One lun assigned to the single server via two wwn number of both cards. So OS detects two devices: /dev/sdb and /dev/sdc. Once we installed the Device Mapper Multipathing. DM-Multipath creates a single device with a unique WWID that reroutes I/O to those four underlying devices according to the multipath configuration. So when there is a failure with any of this I/O paths, Data can be accessible using the available I/O Path.

Install the  Device Mapper Multipath package.

Verify the device-mapper-multipath package has been installed or not.

[root@linux1 ~]# rpm -q device-mapper-multipath

If it is not installed, Install the Device Mapper Multipath package using yum to avoid dependencies issue. if yum is not configured, please refer the link Yum Configuration on Linux.

[root@linux1 ~]# yum -y install device-mapper-multipath

Basic Configuration of Linux Device Mapper Multipathing

Configuration file is /etc/multipath.conf file, take a backup of it. Edit the configuration file to ensure you have the following entries uncommented out.

Read more

Share