IBM i Single Level Store … In Lieu of a Crystal Ball

When the System/38 was being architected, it was recognized that underlying hardware technology was subject to unpredictable change. While it didn’t take a crystal ball to understand that change would be inevitable, having one to forecast the future of storage technology sure would have been nice. But as we all know, there is no crystal ball. This reality led to the development of Single Level Store. A key feature of Single Level Storage (SLS) architecture is that it insulates the upper-level code from the specifics of the storage technology it uses. Along with the Technology Independent Machine Interface, TIMI, SLS is a fundamental element of the design that has allowed IBM i to continue to take advantage of new capabilities seamlessly.