Optimized segment cleaning technique

摘要: An optimized segment cleaning technique is configured to efficiently clean one or more selected portions segments of a storage array coupled nodes cluster. A bottom-up approach the read all blocks be cleaned (i.e., an “old” segment) locate extents stored on SSDs old and examine extent metadata determine whether are valid and, if so, relocate being written “new” segment). top-down obviates reading instead, examines segment. hybrid may extend include only full stripe operations needed for relocation reconstruction as well retrieval from stripes, while also avoiding any unnecessary bottom-down approach.