Using the IXGDELET service, you can mark some or all of the log blocks in the log stream for deletion. The IXGDELET service can be invoked from an unauthorized (non-supervisor state, problem program key mode) with the exception of when the MODE=SYNCEXIT option is used as described in topic Coding a system logger complete exit for IXGBRWSE, IXGWRITE, and IXGDELET. Additionally, when a log stream resource manager is active, it runs authorized (supervisor state, system PKM) and can affect the delete requests for the log stream.