An SVC dump is written each time the FRR routine (IATSNDF) is entered. This FRR routine handles abends that occur during SNA RJP processing under an SRB. Therefore, control of dumping depends on the recursion control of the FRR preventing more than two retry failures. (A dump is taken for every retry failure.) The areas dumped are: SQA, ALLPSA, NUC, LSQA, RGN, TRT, CSA, and LPA.