Browse Prior Art Database

Storage Protection Key Errors

IP.com Disclosure Number: IPCOM000042624D
Original Publication Date: 1984-Jun-01
Included in the Prior Art Database: 2005-Feb-04
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Christensen, NT: AUTHOR [+3]

Abstract

The following technique relates to configuring redundant key arrays in a running system to duplicate storage keys as well as a mechanism to detect a forced key error versus a real key error. This implementation removes the dependency upon a track record of previously detected key errors. An additional bit, in addition to the parity bit, is added to indicate a forced key error. When the key is fetched, if the forced key error is on, a special return code is given. If it is not on, then the normal error return code is given. Error analysis is not done for forced key errors.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 1

Storage Protection Key Errors

The following technique relates to configuring redundant key arrays in a running system to duplicate storage keys as well as a mechanism to detect a forced key error versus a real key error. This implementation removes the dependency upon a track record of previously detected key errors. An additional bit, in addition to the parity bit, is added to indicate a forced key error. When the key is fetched, if the forced key error is on, a special return code is given. If it is not on, then the normal error return code is given. Error analysis is not done for forced key errors. The setting of the forced key error parity bit is done when a redundant array is added by setting the source array hardware in a mode so that upon a fetch, if the key is in error, an automatic write takes place to the redundant array, indicating forced key error in that array. When it is fetched from that array, the return code indicates no error analysis is to be done. All new writes reset the forced key error parity bit.

1