StaaS(Storage as a Service) has been envisioned as the next generation architecture of IT enterprise. Enterprise, individual end users move more and more important information to outsourced data centers, where the dat...StaaS(Storage as a Service) has been envisioned as the next generation architecture of IT enterprise. Enterprise, individual end users move more and more important information to outsourced data centers, where the data may be misappropriated in the malicious model. Moreover, users hesitate to store data in the cloud storage because of network fluctuation. Security and availability become the main concern of cloud storage. This paper, to address these issues, presents an architecture of High Available cloud Storage Gateway(HASG). In our design, data file is divided into implicit, redundant blocks by file fragment algorithm. Part of these blocks, which are stored on different designated cloud servers, can be used to reconstruct original file. Additionally, dynamic service provider selection algorithm and redundant block mechanism for file updating is proposed to effectuate cost and bandwidth savings and accelerate data accessing. Experimental results illustrates that our design enhanced security of cloud storage and improved data access efficiency.展开更多
Replicating caches across distributed nodes to convert remote data transferred for local data reading, are widely used to reduce latency for applications and enhance storage availability in a distributed software syst...Replicating caches across distributed nodes to convert remote data transferred for local data reading, are widely used to reduce latency for applications and enhance storage availability in a distributed software system. DCC (Distributed Cache Consistency) is an mixed geo-replicated protocol to allow consistency of distributed caches by properly the relaxing read-write constraint.DCC reduces the number of required message round-trips in synchronization by taking advantage of a combination of Fast Paxos and Lease. At the same time, a lease protocol and a local synchronization group is used to reduce the message transmission and collision probability. A simple calculation model is set up to predict the performance of the model and analyze the potential application fieldsof DCC. The results, based on actual system observation parameters, show that DCC meets different consistency requirements for a distributed cache in scalable applications by adjustment of configuration parameters.展开更多
文摘StaaS(Storage as a Service) has been envisioned as the next generation architecture of IT enterprise. Enterprise, individual end users move more and more important information to outsourced data centers, where the data may be misappropriated in the malicious model. Moreover, users hesitate to store data in the cloud storage because of network fluctuation. Security and availability become the main concern of cloud storage. This paper, to address these issues, presents an architecture of High Available cloud Storage Gateway(HASG). In our design, data file is divided into implicit, redundant blocks by file fragment algorithm. Part of these blocks, which are stored on different designated cloud servers, can be used to reconstruct original file. Additionally, dynamic service provider selection algorithm and redundant block mechanism for file updating is proposed to effectuate cost and bandwidth savings and accelerate data accessing. Experimental results illustrates that our design enhanced security of cloud storage and improved data access efficiency.
文摘Replicating caches across distributed nodes to convert remote data transferred for local data reading, are widely used to reduce latency for applications and enhance storage availability in a distributed software system. DCC (Distributed Cache Consistency) is an mixed geo-replicated protocol to allow consistency of distributed caches by properly the relaxing read-write constraint.DCC reduces the number of required message round-trips in synchronization by taking advantage of a combination of Fast Paxos and Lease. At the same time, a lease protocol and a local synchronization group is used to reduce the message transmission and collision probability. A simple calculation model is set up to predict the performance of the model and analyze the potential application fieldsof DCC. The results, based on actual system observation parameters, show that DCC meets different consistency requirements for a distributed cache in scalable applications by adjustment of configuration parameters.
