IEC111E

Explanation
D indicates that the volume on a device is to be
demounted. The control program has determined that this volume, mounted
in response to an earlier mount message, is not the requested volume.
In
the message text: dev
The device number of the specified device.
ser
The volume serial number.

Operator response
Demount the volume. The system will then request
that the correct volume be mounted.

Source
DFSMSdfp

Module
IGG0CLBL

Routing code
11

Descriptor code
6