Reason:
A permanent I/O error occurred while CA VM:Tape was trying to read or write a lock record using the Shared Disk facility. The return code and sense bytes from the Diagnose X'20' are displayed. CA VM:Tape ends with an SDC004 abend.
Action:
See the reference manual for the appropriate magnetic tape subsystem for information on sense bytes; and refer to the appropriate z/VM System Facilities for Programming for information on Diagnose X'20'. If the problem persists, contact your system support personnel.
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