Cloud file systems must address challenges that are not addressed by traditional network or distributed file systems . These challenges mostly revolve around isolation, identity, and privacy, but also include features such as adaptability to frequent changes in demand for capacity or capability . In this article, I’ll elaborate on some of these challenges and describe how one project, CloudFS, ...

We consider a Video-on-Demand system in which multiple copies of each movie file are kept in separate disks. Various schemes for file allocation and retrieval are considered and compared. We have introduced a certain easy-to-implement scheme that requires 15% more storage than another certain harder-to-implement scheme.

We consider the problem of broadcasting a viral video (a large file) over an ad hoc wireless network (e.g., students in a campus). Many smartphones are GPS enabled, and equipped with peer-to-peer (ad hoc) transmission mode, allowing them to wirelessly exchange files over short distances rather than use the carrier’s WAN. The demand for the file however is transmitted through the social network ...

The NASA Task Load Index (TLX) is a popular technique for measuring subjective mental workload. It relies on a multidimensional construct to derive an overall workload score based on a weighted average of ratings on six subscales: mental demand, physical demand, temporal demand, performance, effort, and frustration level. A program for implementing a computerized version of the NASA TLX is desc...

We describe how to manage distributed file system caches based upon groups of files that are accessed together. We use file access patterns to automatically construct dynamic groupings of files and then manage our cache by fetching groups, rather than single files. We present experimental results, based on trace-driven workloads, demonstrating that grouping improves cache performance. At the fi...

With rapid growth of producing high-resolution digital contents such as Full HD, 4K, and 8K movies, the demand for low cost and high throughput sharing of content files is increasing at digital content productions. In order to meet this demand, we have proposed DRIP (Distributed chunks Retrieval and Integration Procedure), a storage and retrieval mechanism for large file sharing using forward e...

Storage resource scheduling is lack of flexibility, and user’ demand for different data is vary. In cloud computing storage resource scheduling process, these data files to be equally are irrational, so it needs a dynamic storage resource scheduling mechanism to distinguish requirements of different data. For the file hot issues that a surge request results in the copy number of the current fil...

Biochemical products have been widely used for treatment of various types of wastewater. The treatment processes with the addition of biochemical products are quite attractive because of their simplicity, minimal use of equipment, they are environmentally friendly and are suitable for the removal of organic pollutants. The purpose of these products is to enhance the activities of beneficial mic...

Research in integrated file systems—file systems that support different types of data and applications with diverse performance requirements—has stagnated since the commercial failure of video-on-demand systems in the 1990s. However, the past two years have seen an acceleration in the development and deployment of several new technologies aimed at web-based multimedia applications. These techno...