Joined: 17 Aug 2007 Posts: 562 Location: Iowa, USA
ANother possibility may be a reference to LINEAR VSAM or PDSE which store data in 4K blocks or "pages". The MVS architecture has the capability to move 4K blocks of storage easily, so these new dataset structures have adopted the page-sized data block.
The system PAGE datasets mentioned in the prior post also contain swapped out storage in 4K blocks.