DSNJ005I ACTIVE LOG COPY n IS ACTIVE, LOG IN DUAL MODE, STARTRBA=...

Explanation
This message is sent when copy 'n' of the log becomes active after
previously being flagged as inactive. STARTRBA is the RBA of the first byte
of log data written on copy 'n' after it was activated.

System programmer response
None required.  However, if recovery is required, information from this
message may be required as input to the change log inventory (DSNJU003) utility.