Managing checkpoint queues in a multiple node system

G - Physics – 06 – F

Patent

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G06F 12/00 (2006.01) G06F 11/14 (2006.01) G06F 12/08 (2006.01) G06F 17/30 (2006.01)

Patent

CA 2440277

Techniques are provided for managing caches in a system with multiple caches that may contain different copies of the same data item. Specifically, techniques are provided for coordinating the write-to-disk operations performed on such data items to ensure that older versions of the data item are not written over newer versions, and to reduce the amount of processing required to recover after a failure. Various approaches are provided in which a master is used to coordinate with the multiple caches to cause a data item to be written to persistent storage. Techniques are also provided for managing checkpoints associated with the caches, where the checkpoints are used to determine the position at which to begin processing recovery logs in the event of a failure.

L'invention concerne des techniques de gestion d'antémémoires dans un système à antémémoires multiples pouvant contenir différentes copies du même article de données. Plus particulièrement, ces techniques permettent de coordonner les opérations d'écriture sur disque auxquelles sont soumis ces articles de données pour s'assurer que les anciennes versions de ces articles ne soient pas écrites sur les versions les plus récentes, et de réduire la puissance de traitement nécessaire pour la reprise après une défaillance. Diverses approches utilisent un maître pour coordonner les antémémoires multiples et permettre l'écriture d'un article de données sur une mémoire rémanente. Par ailleurs, l'invention concerne des techniques permettant de gérer les points de contrôle associés aux antémémoires, ces points de contrôle étant utilisés pour déterminer le point où débutera le traitement de reprise dans le cas d'une défaillance.

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