De-duplication，即重复数据删除，它是一种目前主流且非常热门的存储技术，可对存储容量进行有效优化。它通过删除数据集中重复的数据，只保留其中一份，从而消除冗余数据。如下图所示。这种技术可以很大程度上减少对物理存储空间的需求，从而满足日益增长的数据存储需求。-De-duplication, deduplication, it is a mainstream and very popular storage technology, can effectively optimize storage capacity. Duplicate data delete data set, retaining only one copy, eliminating redundant data. As shown below. This technology can greatly reduce the demand for physical storage space, so as to meet the growing demand for data storage.