So... a brief update in case anyone is really interested.
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A couple of little tweaks to the COBOL code and to the VSAM cluster setup, and it all appears to have worked. A hundred thousand segments loaded onto a new DL/I database successfully, and read back/printed using IDCAMS.
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Just one interesting thing, there's a 100,001st segment loaded at the back end of the VSAM file, which appears to have some kind of high-values key. I suspect that it's been added there by DL/I or VSAM for some obscure reason that will
hopefully become clear in due course.
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I hope to have time soon to get onto some real testing - updating segments, inserting and deleteing segmants, and so on.