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Dynamically Changeable Storage Error Analysis

IP.com Disclosure Number: IPCOM000048041D
Original Publication Date: 1981-Dec-01
Included in the Prior Art Database: 2005-Feb-08
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Wright, TR: AUTHOR

Abstract

The address of an uncorrectable storage error is saved and used to monitor subsequent storage selects. When subsequent storage selects are made to the storage element in which the uncorrectable error occurred, the system is switched to "full recording mode" in which a log is kept of correctable storage errors.

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Dynamically Changeable Storage Error Analysis

The address of an uncorrectable storage error is saved and used to monitor subsequent storage selects. When subsequent storage selects are made to the storage element in which the uncorrectable error occurred, the system is switched to "full recording mode" in which a log is kept of correctable storage errors.

Correctable storage errors are normally corrected (e.g., by an error correcting code), and no record of them is maintained. The record that is kept of uncorrectable storage errors will help to pinpoint an element of storage which is failing, but will generally not pinpoint specific array cards within the element.

If the addresses of uncorrectable errors are saved, they can be compared to addresses utilized in subsequent storage selects. The result of this comparison can then be used to put the system into a "full record mode" when the defective storage element is accessed. In full record mode, the system maintains a log of each correctable error in addition to the uncorrectable errors. The log of correctable errors, in addition to the log of uncorrectable errors, will enable a Field Engineer to more readily identify specific array cards within the storage element that are giving rise to errors. Basically this technique enables the system to identify a portion of storage in which there is a problem (signals by the occurrence of an uncorrectable error) and then begin gathering detailed information (historical log...