There are many kinds of swap space. PxT accurately decribes disk space swap. Mr JuniorUnix accurately describes file space swap. Most people consider file space swap to be much less efficient and slower than disk space swap. I would recommend some research into the subject and make sure that you will be happy with file space swap vs. disk swap. Just to let you know, we never use file swap and always use raw disk swap. There is a considerable difference in performance between the two, as I recall.