Disk writes in a distributed shared disk system

Details Disk writes in a distributed shared disk system Disk writes in a distributed shared disk system

G - Physics

06

F

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

Patent

CA 2438262

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 porte sur des techniques de gestion des antémémoires d'un système à antémémoires multiples pouvant comporter plusieurs copies du même objet de données, et spécifiquement sur des techniques de coordination des opérations d'écriture sur disque de ces objets de données de manière à garantir que leurs versions les plus anciennes ne recouvrent pas les plus récentes, tout en réduisant le volume des traitements requis pour une reconstitution faisant suite à une erreur. Différentes approches utilisant un maître assurent la coordination entre les différentes antémémoires en vue du stockage des objets de données dans une mémoire persistante. L'invention porte également des techniques de gestion de points de contrôle associés aux antémémoires, qui servent à déterminer la position où doit commencer le traitement des enregistrements de récupération en cas d'erreur.

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