Reason:
A device I/O error occurred when attempting to read the volume label of the volume on which the control file resides. This error can result from an attempt to access a device that is not attached, or from a unit exception occurring during access. The error occurred while processing an entry in the DDNAMES MIM file. CA MIM for z/VM ignores the indicated DDNAMES MIM entry and continues initialization.
Action:
Verify that a link has been properly established to the device on which the control file resides, and that the device is operating properly.
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