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Time Stamp Identification of Single Level Storage Volumes

IP.com Disclosure Number: IPCOM000046771D
Original Publication Date: 1983-Aug-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Phillips, GH: AUTHOR

Abstract

When a single computer is used to run different versions or levels of an operating system, it is usually necessary to insure that the direct-access storage devices (DASDs) which are used for levels or versions different than the one being run are switched offline. If this is not done or if the wrong devices are switched offline, there is a danger that the devices which are online might cause erratic and unpredictable operating results and data on those devices may be lost because of the oversight or error. The operational and integrity problems which arise when more than one version or level of an operating system is run on a single computer are solved by providing a unique identifier for the DASDs.

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Time Stamp Identification of Single Level Storage Volumes

When a single computer is used to run different versions or levels of an operating system, it is usually necessary to insure that the direct-access storage devices (DASDs) which are used for levels or versions different than the one being run are switched offline. If this is not done or if the wrong devices are switched offline, there is a danger that the devices which are online might cause erratic and unpredictable operating results and data on those devices may be lost because of the oversight or error. The operational and integrity problems which arise when more than one version or level of an operating system is run on a single computer are solved by providing a unique identifier for the DASDs. More particularly, the DASDs which constitute the single level store are all time stamped at the time that they are initialized with the same time stamp. In this way, all DASDs of the same operating system receive the same time stamp to uniquely identify the DASDs as belonging to that operating system. During subsequent system loads, these DASDs can then be identified and used, and those DASDs which belong to versions or levels of an operating system different than that being used and therefore initialized at different times can be ignored. This eliminates both the need to switch any DASDs offline and any integrity problems which might be encountered by running with the wrong DASDs online.

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