基于对象的存储系统对象迁移策略

Strategies of Object Migration for Object-based Storage System

对象存储系统是下一代网络存储重要组织模式,对象管理是对象存储系统的关键技术之一。本文对对象存储系统中的对象迁移策略进行了系统的研究,提出了可变阈值和阈长的动态反馈调整模型,以此来确定存储对象迁移的时机和目标对象存储设备的选取。另外,本文还利用Petri网工具对对象存储系统存储对象的迁移进行建模分析,给出了存储对象迁移控制的Petri网模型。但是随着存储系统存储节点的无限增加,Petri网模型将会无限复杂和庞大。为了减少Petri网模型控制模型的复杂度,又引入有色Petri网理论,实现了对存储对象迁移控制Petri网模型的简化。该模型同样很好地实现了对象存储系统中对象迁移控制的建模分析。这些研究对我们在建立对象存储系统时起到了很好的帮助作用。

Object-based storage（OBS）is an important storage model for storage systems in the next generation Internet, where object management is one of the key components. In this paper we study an object migration strategy for objectbased storage systems that dynamically adjusts the variable-threshold through a feedback model to determine the best OBS device for object migration that minimizes migration times. A Petri-net model is developed to analyze the performance of the proposed strategy. In this analytical model, a migration-controllable model is employed to reduce the complexity of the original Petri-net model. This study provides useful insight into the design of OBS systems and can help to make sensible design decisions.