DFSAOS80
Module DFSAOS80 is the OSAM I/O Check Routine. After DFSAOS70 has initiated the I/O DFSAOS80 waits for its completion.
If the I/O is not completed successfully, an error message and IMS log record are formatted and written.
Hints
In a heavy OSAM I/O environment DFSAOS80 will have a small but measurable CPU usage. It should never be a performance factor.
Reference Sources
More information is available in the IMS SVSOURCE Library Data Set. See your IMS systems programmer.