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Answer Posted / e s hudders
The answer is it depends. A VSAM file can have up to 123 extents in VSE and up to 255 in MVS. This is by component, that is index and data. Any time that a primary or secondary is allocated, VSAM can satisfy this request in up to 5 extents. Each extent counts towards the maximum. So, if for some reason you requested 500 cylinders and VSAM satisfied this request with 5 separate extents that total the 500 cylinders, then you have to subtract this number from the maximum allowed. The same applies to a secondary allocation. So, although in theory you could say that you could have the maximum allowed minus 1 (for the primary), in reality it could be less. Also, remeber that if you have multi-volumes allocated, you would get a primary allocation on the new volume when there is no space for the secondary on the current volume. This would not apply for a VSAM data set defined using SMS in MVS where you can request that the secondary allocation be applied to a new volume.
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