We present a system which enables a user to remove a le from both the le system and all the backup tapes on which the le is stored. The ability to remove les from all backup tapes is desirable in many cases. Our system erases information from the backup tape without actually writing on the tape. This is achieved by applying cryptography in a new way: a block cipher is used to enable the system ...

PURPOSE The American College of Cardiology, the American Heart Association, and the Society for Cardiovascular Angiography and Interventions strongly recommend that primary Percutaneous Coronary Intervention (PCI) should be performed in facilities that have an experienced cardiovascular surgical team available as emergency backup for all procedures. The current study investigates the medical so...

Process allocation is important for fault-tolerant multi-computer systems since it directly aaects the performance and dependability of the system. In this paper, we consider load-balancing process allocation for fault-tolerant systems that balances the load before as well as after faults start to degrade the performance of the system. We show two schemes to tolerate multiple faults in the pass...

When persistent storage fails, traditional media recovery first restores an old backup image followed by replaying the recovery log since the last backup operation. Restoring a backup can take hours, but log replay often takes much longer due to its random access pattern. We introduce single-pass restore, a technique in which restoration of all backups and log replay are performed in a single o...

Physical level backups offer increased performance in terms of throughput and scalability as compared to logical backup models, while still maintaining logical consistency [2]. As the trend toward virtualization grows, virtual machine backups (a form of physical backup) are even more important, while becoming easier to perform. The downside is that physical backup generally requires more storag...

One of the major challenges in wireless sensor networks (WSN) is to meet the energy constraint of its sensor nodes while ensuring reliability of the system. Clustering is an effective self-organization approach to offer energy-efficient communication for WSNs. However, energy of a sensor node dynamically decreases when it plays a role of a cluster head. As a result some nodes die faster that sh...