分布式文件系统的元数据性能是制约系统整体性能的关键瓶颈.尽管固态盘(Solid State Drive,SSD)提供高速的数据访问,但是由于元数据呈现粒度小、更新频繁的特征,SSD的性能表现仍然较差,同时导致寿命损耗加速.基于SSD存储介质的写入特性...分布式文件系统的元数据性能是制约系统整体性能的关键瓶颈.尽管固态盘(Solid State Drive,SSD)提供高速的数据访问,但是由于元数据呈现粒度小、更新频繁的特征,SSD的性能表现仍然较差,同时导致寿命损耗加速.基于SSD存储介质的写入特性,提出了面向分布式文件系统元数据的数据管理机制和更新方法,包括元数据内存页面的重新组织和管理、多次变化数据的迭代更新、元数据写入方式的进一步优化等.所提方法减少了元数据更新的写入频次和实际写入量,减少了随机写操作,提高了元数据写入性能.展开更多
Metadata is one of the six key technologies of Digital Earth,which is also an important aspect in buildingand implementing the Digital City. Based on the technologies and standards of Web Services ,the author came up ...Metadata is one of the six key technologies of Digital Earth,which is also an important aspect in buildingand implementing the Digital City. Based on the technologies and standards of Web Services ,the author came up witha metadata services architecture in the distributed heterogeneous network environment of Digital City. In this paper,the metadata services architecture is described and explained in detail,including the related standards,technologies,that,based on the Web service,to build the metadata service architecture will be practically meaningful for organizing,managing and sharing the information resources in Digital City.展开更多
文摘分布式文件系统的元数据性能是制约系统整体性能的关键瓶颈.尽管固态盘(Solid State Drive,SSD)提供高速的数据访问,但是由于元数据呈现粒度小、更新频繁的特征,SSD的性能表现仍然较差,同时导致寿命损耗加速.基于SSD存储介质的写入特性,提出了面向分布式文件系统元数据的数据管理机制和更新方法,包括元数据内存页面的重新组织和管理、多次变化数据的迭代更新、元数据写入方式的进一步优化等.所提方法减少了元数据更新的写入频次和实际写入量,减少了随机写操作,提高了元数据写入性能.
文摘Metadata is one of the six key technologies of Digital Earth,which is also an important aspect in buildingand implementing the Digital City. Based on the technologies and standards of Web Services ,the author came up witha metadata services architecture in the distributed heterogeneous network environment of Digital City. In this paper,the metadata services architecture is described and explained in detail,including the related standards,technologies,that,based on the Web service,to build the metadata service architecture will be practically meaningful for organizing,managing and sharing the information resources in Digital City.
