SUMMARYIn today's Grids, files are usually managed by Grid data management systems that are superimposed on existing file and storage systems. In this paper, we analyze this predominant approach and argue that object-based file systems can be an alternative when adapted to the characteristics of a Grid environment. We describe how we are solving the challenge of extending the object-based storage architecture for the Grid in XtreemFS, an object-based file system for federated infrastructures.

Digital nudging in privacy has become more important to protect users of information systems while working with privacy-related data. Nudging is about altering a user's behavior without forbidding any options. Several approaches exist to "nudge" users to change their behavior. Regarding the usage of digital privacy nudges, research still has to understand the meaning and relevance of individual nudges better. Therefore, this paper compares the preferences of users for different digital nudges. To achieve this goal, it presents the results of a so-called best-worst scaling. This study contributes to theory by providing a better understanding of user preferences regarding design variations of digital nudges. We support practitioners by giving implications on how to design digital nudges in terms of user preferences. PublicAl l workspace members can join 75% of your colleagues do not share their phone number with others.You have published 80% of your private informations Closed channels can only beused with an invitation and are not visible in the channel list. PrivatBy default, these channels are private Cl os ed channels ca n only be used with an i nvi tation an a re not vi sible in the channel list Privat Anna, Andreas, Nicole, and 26 others can see this message

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A lease is a token which grants its owner exclusive access to a resource for a defined span of time. In order to be able to tolerate failures, leases need to be coordinated by distributed processes. We present FaTLease, an algorithm for faulttolerant lease negotiation in distributed systems. It is built on the Paxos algorithm for distributed consensus, but avoids Paxos' main performance bottleneck of requiring persistent state. This property makes our algorithm particularly useful for applications that can not dispense any disk bandwidth. Our experiments show that FaTLease scales up to tens of thousands of concurrent leases and can negotiate thousands of leases per second in both LAN and WAN environments.

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