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Multipath troubleshooting (Doc ID 2253863.1)

Last updated on JUNE 04, 2021

Applies to:

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


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
 DM Path States
 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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