What is multipathing in Linux?

Multipathing allows the combination of multiple physical connections between a server and a storage array into one virtual device. This can be done to provide a more resilient connection to your storage (a path going down will not hamper connectivity), or to aggregate storage bandwidth for improved performance.

How do I find my multipath version?

You can use the -l and -ll options of the multipath command to display the current multipath configuration. The -l option displays multipath topology gathered from information in sysfs and the device mapper.

What is native multipathing?

Native Multipathing Plugin (NMP) The NMP is an extensible module that manages subplugins. There are two types of NMP subplugins: Storage Array Type Plugins (SATPs), and Path Selection Plugins (PSPs). SATPs and PSPs can be built-in and provided by VMware, or can be provided by a third party.

What is the recommended multipathing solution for Red Hat Enterprise Linux 8?

Red Hat recommends that you use DM Multipath in Red Hat Enterprise Linux 8 as your default multipathing solution. 16.2. Enabling native NVMe multipathing This procedure enables multipathing on connected NVMe devices using the native NVMe multipathing solution.

How do I keep multipath device names consistent in Red Hat?

To keep your multipath device names consistent in every node, Red Hat recommends to disable the user_friendly_names option. For example, a node with two HBAs attached to a storage controller with two ports by means of a single unzoned FC switch sees four devices: /dev/sda, /dev/sdb, /dev/sdc, and /dev/sdd.

How do I set up multipath in Linux?

You can run set up multipathing in the initramfs file system. If you run multipath from the initramfs file system and you make any changes to the multipath configuration files, you must rebuild the initramfs file system for the changes to take effect.

What is the default name of a multipath device in Linux?

When the user_friendly_names configuration option is set to no, the name of the multipath device is set to World Wide Identifier (WWID). By default, the name of a multipath device is set to its WWID. The device name would be /dev/mapper/WWID. It is also created in the /dev/ directory, named as /dev/dm-X .

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