LIU Xiaojun, HU Zhihua, PAN Shaoming. Control Strategy for the Number of Replica in Smart City Cloud Stroage System[J]. Geomatics and Information Science of Wuhan University, 2016, 41(9): 1205-1210. DOI: 10.13203/j.whugis20140440
Citation: LIU Xiaojun, HU Zhihua, PAN Shaoming. Control Strategy for the Number of Replica in Smart City Cloud Stroage System[J]. Geomatics and Information Science of Wuhan University, 2016, 41(9): 1205-1210. DOI: 10.13203/j.whugis20140440

Control Strategy for the Number of Replica in Smart City Cloud Stroage System

  • The number of replicas in the control strategy of a traditional distributed file system is calculated based on internal resources while changes in external demand are ignored. However, this strategy is not suitable for deployment in a service-based, resource-rich internal storage "smart city" cloud storage center. We propose a control model for the number of replicas ,which combines data security(the minimum amount of copies)together with service needs (best copy volume). A predictive algorithm based on double time granularity is included in this model to predict the popularity of a file. In addition, the number of copies in the cloud adjusts itself dynamically according to the popularity of a file and system resources. Simulation experiment results show that the accuracy of double time granularity forecasting is greatly increased. Compared to the original static copy, a dynamic copy mechanism based on double time granularity prediction has a significant advantage in response to sudden large-scale concurrent accesses and its storage resources occupancy rate is low.
  • loading

Catalog

    /

    DownLoad:  Full-Size Img  PowerPoint
    Return
    Return