IEB100I

Explanation
An I/O error was encountered while reading the
specified member. Message IEB139I, which gives detailed information
regarding the location of the error record, is always issued previous
to this message.
In the message text: memname
The specified member name.

System action
The next COPY control statement is sought unless
a data check occupies the key or data portion. In this case, the error
is ignored and data is copied as it came into main storage. If the
copy is performed, the return code is 4; if not, the return code is
8.

System programmer response
If the error recurs and the program
is not in error, look at the messages in the job log for more information.
Search problem reporting data bases for a fix for the problem. If
no fix exists, contact the IBM® Support Center. Provide the
JCL and all printed output and output data sets related to the problem.

Programmer response
Depending on the type of error, rerun the
COPY operation with the data set in error allocated: At a different physical location on the volume.
On a different device.
On a different channel.

 If the error is on an input data set, it may be necessary to
re-create the data set.

Source
DFSMSdfp