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Combined HASH INDEX and Primary Directory

IP.com Disclosure Number: IPCOM000034667D
Original Publication Date: 1989-Apr-01
Included in the Prior Art Database: 2005-Jan-27

Publishing Venue

IBM

Related People

Authors:
Frye, HE Hoffman, RL Weigel, JP [+details]

Abstract

The System/38 product line has evolved such that faster systems with larger main storage are required. Increasing the memory size makes efficient address translation more critical. Larger storage also increases the requirements of VMC storage management to, for example, handle more DASD devices to support the larger system. Specifically, enhancement of the virtual address translation table structure is required to: 1. Expand the maximum allowable main storage to 256 MB (2**19 entries in the primary directory). 2. Provide faster address translation. 3. Provide expanded storage for VMC storage management data (15 bytes per primary directory entry). 4. Combine relevant address translation data at one location. The virtual address translation tables in Fig.