Disk volumes can become fragmented to the degree that even though there are many free tracks available, requests to allocate new data sets will still fail. This is caused by the free space being in such small extents that it is unusable; that is, a track here, another there, but 15 tracks together can't be found.
Due to the lack of disk management tools in the past, the only recourse seemed to be to reorganize the pack, now commonly known as defragging it. Although there are times when this is needed, CA Disk provides other alternatives that can solve the real problem with much less system impact.
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