红外与激光工程, 2016, 45 (9): 0935002, 网络出版: 2016-11-14   

磁光阵列: 一种新型数据存储模式的实现

ORAID——The implementation of a new data storage mode
作者单位
苏州互盟信息存储技术有限公司, 江苏 苏州 215151
摘要
介绍了一种磁盘与光盘融合数据安全存储的新模式, 简称磁光阵列或ORAID(Optical Replicated Arrays of Independent Disks)。ORAID模式包括: 将数据同时存储到磁盘模块和光盘模块中; 可根据数据的属性信息从磁盘模块中读取数据, 在目标磁盘无法被读取时, 可根据数据在光盘模块中对应的位置信息, 将存储有目标数据的光盘中的数据读入预设的数据缓冲区; 将存储有目标磁盘数据的光盘中的数据存储到磁盘模块中更换后的新磁盘中。该模式在使用上像基于硬盘的系统一样方便, 读写性能与RAID(Redundant Arrays of Independent Disks)一样; 在数据安全方面, 无论前端硬盘如何损坏数据都不会丢失, 并且在硬盘坏损以及重建过程中保持数据的可提供性; ORAID具有物理层面上的合规性, 所存的数据不可更改(WORM, Write Once Read Only)并可在无迁移的情况下长期保存50年以上; ORAID无须额外的备份系统。磁光阵列模式同样适用于固态硬盘与光盘的融合。
Abstract
A system concept called ORAID(Optical Replicated Arrays of Independent Disks) was presented in which the hard disks and optical media were converged into high performance WORM(Write Once Read Many) appliances in a way so that no additional tier was added to the existing storage system architecture. An ORAID product typically includes a full-range of non-redundant hard disk array on the front end and an optical library in the background where the optical library is hidden and therefore invisible to the user interface. The hard disk array can be formed as a NAS(Network Attached Storage) merged together with a database-driven hidden library. The user can access their file systems as usual with all the ease and comfort without additional integration efforts. ORAID effectively uses the lifetime of each individual hard disk in the array so the data migration overhead and the data loss risk can be significantly reduced. Unlike the conventional redundant technologies like RAID(Redundant Arrays of Independent Disks) or erasure coding where the number of defective disks allowed is limited, there is no correlation between the hard disks, and data on an ORAID system will never be lost no matter how many HDDs (Hard Disk Drives) are defect. Because of its physical nature the WORM/compliance will be ensured for optical media and this feature can also be realized for the hard disk front end by using HASH coding. In case of disk failure or any HDD absence the related data on the optical media will be automatically activated so that the data availability will be guaranteed when hard disks are somehow not accessible, e.g. during the hard disk rebuild process or replacement work. In an ORAID system, data on HDD and optical media is mutually protected. A health check process is keeping the integrity and safeguards against media failure. ORAID implements an integrated hybrid media storage in which the explicit backup process can also be eliminated. The logical consequence of greatly reduced workload for the optical drives and robotics will lead to less maintenance overhead on the library side and significant improvement of the working lifetime of the optical drives.

刘建梅, 宋林峰, 冯剑楠, 唐建华, 徐宏, 邵征宇, 许长江, 朱明. 磁光阵列: 一种新型数据存储模式的实现[J]. 红外与激光工程, 2016, 45(9): 0935002. Liu Jianmei, Song Linfeng, Feng Jiannan, Tang Jianhua, Xu Hong, Shao Zhengyu, Xu Changjiang, Zhu Ming. ORAID——The implementation of a new data storage mode[J]. Infrared and Laser Engineering, 2016, 45(9): 0935002.

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