Browse Prior Art Database

Task Suspense for Channel Detected Alpha Correction

IP.com Disclosure Number: IPCOM000046879D
Original Publication Date: 1983-Aug-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 51K

Publishing Venue

IBM

Related People

Meltzer, D: AUTHOR [+4]

Abstract

Where there is a high soft failure rate in channel accesses to memory, this scheme will correct such errors without indicating permanent damage to the system. As shown in the flow diagram, the detection of an uncorrectable error (UE) causes the I/O operation in progress with its target device to be terminated. However, the I/O interruption that signals this abnormal termination is held in abeyance until the service processor performs alpha correction on the failed storage area. Upon completion, the service processor signals the channel to cause the suspended I/O interruption to be indicated to the processor. This delay mechanism for posting the I/O interruption insures that subsequent retry of the I/O operation will execute successfully if the UE was alpha particle induced.

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Task Suspense for Channel Detected Alpha Correction

Where there is a high soft failure rate in channel accesses to memory, this scheme will correct such errors without indicating permanent damage to the system. As shown in the flow diagram, the detection of an uncorrectable error (UE) causes the I/O operation in progress with its target device to be terminated. However, the I/O interruption that signals this abnormal termination is held in abeyance until the service processor performs alpha correction on the failed storage area. Upon completion, the service processor signals the channel to cause the suspended I/O interruption to be indicated to the processor. This delay mechanism for posting the I/O interruption insures that subsequent retry of the I/O operation will execute successfully if the UE was alpha particle induced. Without this delay mechanism, the I/O operation would have been retried prematurely, resulting in failure.

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