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存储系统中的主流快照技术有四种:分割镜像快照技术、按需复制快照技术、虚拟视图快照技术和增量快照技术。这四种快照技术各有长处和不足,不同的应用系统应选择不同快照技术。存储系统中快照技术有三种使用方法:冷快照拷贝、暖快照拷贝和热快照拷贝。在数字图书馆建设中,选择支持虚拟视图快照技术的存储设备不但节约资金,还可节省存储空间和保证数据安全。
There are four mainstream snapshot technologies in a storage system: split mirror snapshot technology, on-demand copy snapshot technology, virtual view snapshot technology, and incremental snapshot technology. These four kinds of snapshot technologies have strengths and weaknesses, different application systems should choose different snapshot technologies. There are three ways to use snapshot technology in a storage system: cold snapshot copy, warm snapshot copy, and hot snapshot copy. In the digital library construction, choose to support the virtual view snapshot technology storage devices not only save money, but also save storage space and ensure data security.