一种超大容量自动光盘库的设计与实现

当前蓝光光盘的寿命已超过50年，光存储的可靠性远高于硬盘，寿命也远长于磁带，但单盘容量较小、存取性能较低的缺点限制了光盘在大规模归档系统中的应用。提出了一种新型超大容量机械手自动换盘的光盘库系统，该系统能够在标准尺寸的机柜中容纳12 000张蓝光光盘，数十个光驱可并行读写，对外的吞吐率达到1 GB/s。除了高度并行之外，还使用了磁光电融合结构和虚拟化存储机制，通过磁电作为光存储的大容量缓存，提高存取性能，将大量的光盘存储空间虚拟成单个文件卷存储池。该系统的光盘调度、刻录和读取完全实现自动化，并提供给用户通用文件访问接口。综合这些技术，既发挥了光存储介质的大容量、长寿命、低成本、低能耗的优点，又克服了光存储系统速度慢、性能低的缺点，同时提供了用户友好的使用界面和环境，实现了与现有信息系统的无缝对接。

Design and implementation of an ultra-large scale automatic optical disc library

More and more digital information needs long term preservation, a cost-efficient storage system is needed to ensure long term data availability. Using tape and hard disk as storage medium can not meet the demands of long-term data preservation. Current blu-ray inorganic disc is able to store data more than 50 years, the fact that the drive and optical disc is separate makes it easy for optical disc to be stored. Optical disc is proved to be a choice for long term preservation. But the capacity of optical disc is too small compared to tape and hard disk, which limits its use in archival storage system. A novel large-scale Automation optical library system is introduced, a standard rack contains more than 10 000 discs, provides 1 GB/s throughput. The fundamental thought is tiered storage with HDD, SSD and optical disc and storage virtualization. HDD and SSD works as cache for optical storage level, thus improve performance; all the optical discs are set to a virtual volume pool. Optical library system implements automatic mechanical dispatch, file access and disc recording by the integration design controll and inner data structure. A common file system interface is provided to users. Experiments result shows that the system can automatically read and record files.