System logger detected that log stream data was not available to connect sysname to repopulate the list structure during structure rebuild for log stream logstream. Log stream data may have been lost and the log stream is marked damaged. As part of structure rebuild, each system participating in the structure rebuild is responsible for repopulating the new structure with log stream data written by that system, and still resident in the original structure (not offloaded to log stream DASD data sets yet) at the time the structure rebuild started. A system does not have a duplex copy of the log stream data in its local buffers, when a log stream data offload failed during log stream recovery processing and the log stream was connected after a system logger failure. The requester is notified with a warning return code on the IXGCONN request when this condition exists.