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GESTION DE MÉTADONNÉES EN FONCTION D'UN DOMAINE AYANT DES STRUCTURES ARBORESCENTES DENSES DANS UNE ARCHITECTURE DE MÉMOIRE DISTRIBUÉE
GESTION DE MÉTADONNÉES EN FONCTION D'UN DOMAINE AYANT DES STRUCTURES ARBORESCENTES DENSES DANS UNE ARCHITECTURE DE MÉMOIRE DISTRIBUÉE
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摘要
In one embodiment, a node coupled to one or more storage devices executes a storage input/output (I/O) stack having a volume layer. The volume layer manages volume metadata embodied as mappings from offsets of a logical unit (LUN) to extent keys associated with storage locations for extents on the one or more storage devices. Volume metadata is maintained as a dense tree metadata structure representing successive points in time. The dense tree metadata structure has multiple levels, wherein a top level of the dense tree metadata structure represents newer volume metadata changes and descending levels of the dense tree metadata structure represent older volume metadata changes. The node accesses a latest version of changes to the volume metadata by searching from the top level to the descending levels in the dense tree metadata structure.
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