Oracle Linux: How To Identify Which Device Is Hidden Behind A /dev/dm-* Device (Doc ID 2067693.1)

Last updated on OCTOBER 22, 2015

Applies to:

Linux OS - Version Enterprise Linux 4.0 and later
Linux x86-64

Goal

When native Linux device multipathing is used, an error may be reported that lists the composite multipath device.  For example:

The error message identifies /dev/dm-9, which is the composite device.  The message does not identify the physical device which encountered the error.

Solution

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