Oracle Linux: Multipath troubleshooting (Doc ID 2253863.1)

Last updated on MAY 09, 2023

Applies to:

Linux OS - Version Oracle Linux 5.1 and later
Oracle Cloud Infrastructure - Version N/A and later
Linux x86-64
Linux x86

Purpose

Object of this document is to provide details on device mapper multipathing (DM-MP).

Troubleshooting Steps

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In this Document

Troubleshooting Steps

Device Mapper Multipathing

DM-MP consists of 4 components

This refers to the DM module(kernel)'s view of the path's state. It can be in one of the two states:

Path Group State: Path Groups can be in one of the following three states

This policy selection can be set by the user through /etc/multipath.conf.

Configuration File (/etc/multipath.conf)

Rebuilding the initrd (Oracle Linux 5)

Rebuilding the initramfs (Oracle Linux 6)

The Linux SCSI layer sets a timer on each command.

Misc tips on Linux Native Multipath

Removed LUN's Continue to Display as PATH Down in the OS Log

Process are stuck in D-state. How can I kill them ?

multipathd –k: Puts your session into interactive mode. Commands can be used to list the current configuration or to change the configuration. For example, <show config> lists the current configuration, and <reconfigure> gets the latest configuration from the configuration file (etc/multipath.conf).

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