CQM905E An unexpected return code from VSAM was encountered while doing a read of the control file.

Explanation
 A VSAM READ error occurred while attempting to
access the data set specified for the Db2 Control File. The
VSAM return code is provided for diagnostic purposes.

User response
 Refer to the z/OS® DFSMS Macro Instructions
for Data Sets (SC26-7408) documentation to resolve, and then
continue.