There was a request to have the DFSMSdss I/O buffers backed up anywhere in 64-bit real storage or below 2 gigabytes in real storage.
If the request was for buffer storage to be backed up below 2 gigabytes in real storage, DFSMSdss attempts to allocate storage for the buffers to be backed up in 31-bit real storage. Otherwise, DFSMSdss allocates I/O buffers backed up anywhere in the 64-bit real storage.
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DFSMSdss