The UNIX Fast File System (FFS) is probably the most widely-used file system for performance comparisons. However, such comparisons frequently overlook many of the performance enhancements that have been added over the past decade. In this paper, we explore the two most commonly used approaches for improving the performance of meta-data operations and recovery: logging and Soft Updates. The com...

In this paper, we present two fault-tolerant protocols for mobile computing systems; a causal message logging protocol and a receiver-based pessimistic message logging protocol for tolerating failures of mobile hosts (MHs) and mobile support stations (MSSs) respectively. The systems raise several constraints such as limited life of battery power, mobility and disconnection of hosts and lack of ...

Cloud computing o ers computational resources such as processing, networking, and storage to customers. Infrastructure as a Service (IaaS) consists of a cloud-based infrastructure to o er consumers raw computation resources such as storage and networking. These resources are billed using a pay-per-use cost model. However, IaaS is far from being a secure cloud infrastructure as the seven main se...

Emerging byte-addressable, non-volatile memory (NVM) is fundamentally changing the design principle of transaction logging. It potentially invalidates the need for flush-beforecommit as log records are persistent immediately upon write. Distributed logging—a once prohibitive technique for single node systems in the DRAM era—becomes a promising solution to easing the logging bottleneck because o...

Emerging byte-addressable, non-volatile memory technologies (NVRAM) like phase-change memory can increase the capacity of future memory systems by orders of magnitude. Compared to systems that rely on disk storage, NVRAMbased systems promise significant improvements in performance for key applications like online transaction processing (OLTP). Unfortunately, NVRAM systems suffer from two drawba...

Among a lot of rollback-recovery protocols developed for providing fault-tolerance for long-running distributed applications, sender-based message logging with checkpointing is one of the most lightweight fault-tolerance techniques to be capable of being applied in this field, significantly decreasing high failure-free overhead of synchronous logging by using message sender's volatile memory as...

in order to investigate distribution status of heavy metals in cropping systems of water logging and dry farming, an experiment was conducted as split-plot arrangement based on randomized complete block design with three replications in research field of sari agricultural science and natural resources university. a paddy-soil considered for water logging system and the planted field with vegeta...

Non-Volatile Memory (NVM) is an emerging memory technology that combines the best properties of current hard disks and main memories by providing non-volatility, high density, high speed, and byte addressability. This provides an opportunity to redesign systems and their software stacks to improve performance and to reduce the complexity. Present-day database systems are designed and optimized ...