On The Method And Implement Of Object Storage Management For Object Storage Device

As a new model for network storage emerged after NAS and SAN, OBS (Object Based Storgae) assigns the responsibilities in lower level storage management to the storage device OSD (Object-based Storage Device), and breaks through many limitations in NAS and SAN. Aiming at objects, the storage unit in OSD, study objects storage management in two sides: file system and hot-spot balance.At first, after analysing the draft standard and advantages of OSD, a new and efficient file system is designed and implemented. It puts the attributes in data area for the scalability in this attributes instead of fixed format in general-purpose file systems. And then, the policy in assigning continuous block is adopted to induce the fragment of files. Using B+-Trees in managing files and blocks in order to solve the limitations in file capability and fasten searching in files and free blocks for improve speed in file I/O.Additional, a balancing strategy, which possesses the characristic in prediction and data copy's migration, is proposed for solving hot-spot data unbalance in OBS. Firstly, OSDs predict its temperature and reports to MDS (Meta Data Service). Secondly, according to the coordination, OSDs move the copies of the object which is as small in size and more in accounts of related clients as possible, the object is chosen by the algorithm of Greedy. Moreover, the way of incremental backup is used to solve the problem in data inconsistency because of the copy migration. The experiment results show that the method successfully controls the error below 8%, and eliminates the hotspot in shorter time compared to other typical approaches.