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Logical VOLUME Duplexing for DATA Availability Disclosure Number: IPCOM000044037D
Original Publication Date: 1984-Oct-01
Included in the Prior Art Database: 2005-Feb-05

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Kropff, CJ Rawson, FL [+details]


This article describes a method of increasing the availability of critical data in a data processing system. A significant problem for many computer users is the unavailability or total loss of their data due to hardware or software failures. By duplexing logical volumes, the incidence of this can be reduced to a very low level without the expensive replication of hardware which occurs in purely hardware-based duplexing systems. The IBM Series/1 is a minicomputer system designed to meet the needs of a wide variety of applications. The Realtime Programming System is a full function operating system for the IBM Series/1. In the Realtime Programming System each disk device known to the system is divided into logical volumes (volumes, for short), and each volume has an entry in the device table of contents (TOC).