The efficiency of large-scale applications is strongly dependent on good data management techniques. In this paper, we claim that the ability to specify data requirements in a time-varying manner facilitates data management and improves application efficiency. This is because requirements such as availability, bandwidth and latency can vary significantly with time. Consequently, the storage sys...

Biography: Sage Weil received his Ph.D. from UCSC in 2006 under the direction of Scott Brandt and Carlos Maltzahn. Sage designed Ceph as part of his PhD research. Since graduating, he has continued to refine the system with the goal of providing a stable next generation distributed file system. Prior to his graduate work, Sage helped found New Dream Network, the company behind Dreamhost web hos...

In this paper, we consider priced-timed automata based exploration for resource-optimal scheduling. Resource-optimal scheduling problems can be seen as an application of real-time model checking in priced domains. State spaces for large problems can easily go beyond the main memory capacity. In this paper, we propose the use of secondary storage devices such as harddisk to store the generated s...

In this paper, we analyze a highly distributed backup storage system realized by means of nano datacenters (NaDa). NaDa have been recently proposed as a way to mitigate the growing energy, bandwidth and device costs of traditional data centers, following the popularity of cloud computing. These service provider-controlled peer-to-peer systems take advantage of resources already committed to alw...

Storage systems have storage devices which run real time embedded software. Most storage devices use C and occasionally C++ to manage and control the storage device. Software for the storage device must meet the time and resource constraints of the storage device. The prevailing wisdom in the embedded world is that objects and in particular Java only work for simple problems and can not handle ...

We study the problem of authenticating the content and creation time of documents generated by an organization and retained in archival storage. Recent regulations (e.g., the Sarbanes-Oxley act and the Securities and Exchange Commission rule) mandate secure retention of important business records for several years. We provide a mechanism to authenticate bulk repositories of archived documents. ...

Numeric time series data has unique storage requirements and access patterns that can benefit from specialized support, given its importance in Big Data analyses. Popular frameworks and databases focus on addressing other needs, making them a suboptimal fit. This paper describes the support needed for numeric time series, suggests an architecture for efficient time series storage, and illustrat...