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Merging mapping metadata to promote reference counting efficiency

机译:合并映射元数据以提高引用计数效率

摘要

A technique for managing metadata in a data storage system designates block pointers as either sources or copies, where sources contribute to reference counts of pointed-to structures but copies do not. The technique maintains parent-child relationships between parent BPSs (block pointer sets) and child BPSs, where each BPS includes an array of block pointers. Each child BPS is created as a copy of a parent BPS and has block pointers initially designated as copies. The technique performs a metadata-merge operation to merge the block pointers of the parent BPS into those of a child BPS by promoting attributes of block pointers in the child BPS from copy to source, avoiding any need to perform reference count updates on structures pointed to by promoted block pointers.
机译:用于管理数据存储系统中的元数据的技术将块指针指定为源或副本,其中源对指向的结构的引用计数起作用,而副本则不起作用。该技术维护父BPS(块指针集)和子BPS之间的父子关系,其中每个BPS包括一个块指针数组。每个子BPS被创建为父BPS的副本,并具有最初指定为副本的块指针。该技术执行元数据合并操作,通过将子BPS中的块指针的属性从副本复制到源,从而将父BPS的块指针合并到子BPS的块指针,从而无需对指向的结构执行引用计数更新通过提升的块指针。

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