Hi, It's because to support 256k when writing and reading a tape, adrdssu use know bsam rather than excp for dump /restore. Unfortunately, it's the default, thus to have a good throughput, you use more cpu cycle. To avoid that, code PARM='USEEXCP=YES' with DCB=BLKSIZE=65520 on the output dataset or if you wan't modify your JCL JOB, use the DSS exit (ADRUIXIT) to set the UFOPARM of UFOEXCP to ON to eliminate the need to code the parm useexcp and blksize=65520. regards
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