In general, normal offloading is triggered when the high offload threshold for coupling facility or staging data set usage for a log stream is reached. However, there are other system events that cause system logger to begin offload processing. In these cases, all the log stream is off-loaded. Events triggering offload include:

• Recovery processing for a log stream. When recovery for a log stream is complete, system logger flushes all log data to DASD. See System logger recovery for details.
• Structure rebuild, for coupling facility log streams.
• When the last connector to a log stream disconnects.
• Entries in-use on the structure reach 90%.