Chapter 8. Troubleshooting DM Multipath

Procedure

1. Disable queueing:

   • For a specific device:

     # multipathd disablequeueing map device

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   • For all devices:

     # multipathd disablequeueing maps

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     After you disable queueing, it will remain disabled until you restart or reload multipathd.

2. Reset queueing to a previous value:

   • For a specific device:

     # multipathd restorequeueing map device

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   • For all devices:

     # multipathd restorequeueing maps

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Procedure

1. Display the multipath configuration, including the default values, before exiting the console:

   # multipathd -k
   multipathd> show config
   multipathd> Ctrl+D

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2. Ensure that multipath picked up all changes to the multipath.conf file:

   # multipathd -k
   multipathd> reconfigure
   multipathd> Ctrl+D

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3. Ensure that the path checker is working properly:

   # multipathd -k
   multipathd> show paths
   multipathd> Ctrl+D

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4. You can also run a single multipathd interactive command directly from the command line, without starting the interactive console. For example, to check that multipath picks up all changes to the multipath.conf file, run the following command:

   # multipathd reconfigure

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