Archive log data sets and BSDS copies

Each time a new archive log data set is created, a copy of the BSDS is also created. If the archive log is on tape, the BSDS is the first data set on the first output volume. If the archive log is on DASD, the BSDS is a separate data set.

The data set names of the archive log and the BSDS copy are the same, except that the lowest-level qualifier of the archive log name begins with A and the BSDS copy begins with B, for example:

Archive log name

CSQ.ARCHLOG1.E00186.T2336229.A0000001

BSDS copy name

CSQ.ARCHLOG1.E00186.T2336229.B0000001

If there is a read error while copying the BSDS, the copy is not created, message CSQJ125E is issued, and the off-load to the new archive log data set continues without the BSDS copy.