Single-Level Store (Paperback)

High Quality Content by WIKIPEDIA articles! Single-level storage (SLS) is a term most often associated with the IBM System i operating system, i5/OS, although it was originally introduced in 1964 by MIT, General Electric and Bell Labs for the Multics time-sharing operating system. IBM first implemented SLS in 1978 in the System/38 and its Control Program Facility (CPF) operating system, the predecessor to i5/OS. ith a single-level storage the entire storage of a computer is thought of as a single two-dimensional plane of addresses, pointing to pages. Pages may be in primary storage (RAM) or in secondary storage (disk); however, the current location of an address is unimportant to a process. The operating system takes on the responsibility of locating pages and making them available for processing. If a page is in primary storage, it is immediately available. If a page is on disk, a page fault occurs and the operating system brings the page into primary storage.