Do not discard archive logs you might need

WebSphere MQ might need to use archive logs during restart. You must keep sufficient archive logs so the system can be fully restored. WebSphere MQ might use an archive log to recover a page set from a restored backup copy. If you have discarded that archive log, WebSphere MQ cannot restore the page set to its current state. When and how you should discard archive logs is described in the WebSphere MQ for z/OS System Administration Guide.