The component trace named SYSnnnn is writing trace entries to an external dataset. It is possible that the external writer is not writing buffers out to the dataset as quickly as the buffers are being filled with trace data.
A second attempt is made to record the current entry in an available buffer. This message will not be reissued.
Notify the system programmer.
Look at the output from the trace with IPCS. If the output contains the dump output message ITT0020I with the reason text 'Trace buffer not marked available by CTRACE. Symrec written', then the external writer was not writing to the external dataset as quickly as the component trace was recording entries. Make sure that the external writer is running with a dispatching priority at least as high as the component being traced. Increase the number of datasets specified in the cataloged procedure for the external writer and/or increase the NCP parameter on each each DD statement specified in the cataloged procedure. Follow the rules for a writer procedure as documented in z/OS MVS Diagnosis: Tools and Service Aids.
The module is named in the message.
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