Browse Prior Art Database

Autonomic Data Retrieval During Initial Microcode Load

IP.com Disclosure Number: IPCOM000034884D
Original Publication Date: 2005-Jan-19
Included in the Prior Art Database: 2005-Jan-19
Document File: 1 page(s) / 21K

Publishing Venue

IBM

Abstract

A method to recover from errors in the loading of a data image during Initial Microcode Load of a system. Loading the data image and recovering from errors while loading it prevents data loss.

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Autonomic Data Retrieval During Initial Microcode Load

     Disclosed is a method to recover from errors in the loading of a data image during Initial Microcode Load (IML) of a system. In some computer environments, an image of data must be retrieved during an IML to prevent data loss. Data will also be lost if this image has an error, and there is no recovery for this error. A method is needed to recover from errors in this image, because errors in this image would cause data loss if the machine finished its IML with this faulty restored data.

     During the IML, the data image is loaded and checked to see there are any errors present. If errors are encountered, the image will be invalidated, and the machine will be rebooted so that the backup data image can be loaded on the next IML.

     Special code must be inserted in two places. First, the function that writes the image of data must be augmented to also write a backup image(s) of data. Second, the IML code must be modified to read the first valid image it finds and then verify the integrity of the data image after it is loaded. If the image fails verification, the image will be invalidated by setting an invalid flag in the image header. Following invalidation, the machine will be rebooted. During the next IML, since the first data image found is invalid, the next data image will be loaded and go through the same processing as before. This method will help prevent data loss using a method to recover from a data image erro...