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Janet, your explanation is good but misses out one small point. Many mainframe systems, if they can't find the primary allocation as contiguous space, will try and get it in up to 5 extents before failing. As a corollary to this, if the systems takes, for example, 4 extents to allocate the primary space request, you only get 12 secondary extents as the maximum number of extents remains at 16. To use the example given by Krishna, this would give you a maximum of 10+(12*5) = 70 tracks - less than the 85 you would expect had the system found 10 contiguous tracks - before the system abends your job.

David - (from linkedin)


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