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This paper presents an OMNeT-based Framework to simulate large complex storage networks, with its corresponding underlying subsystems (I/O, Networking, etc.). With this Framework, custom environments can be configured and deployed on a flexible and easy way. The most interesting features of this Framework are its flexibility and scalability, so the(More)
This paper considers the question of saving energy in the disk drive making advantage of diverse devices in a hybrid storage system employing flash and disk drives. The flash and disk offer different power characteristics, being flash much less power consuming than the disk drive. We propose a technique that uses a flash device as a cache for a single disk(More)
Delta oscillations contribute to the human P300 event-related potential evoked by oddball targets, although it is unclear whether they index contextual novelty (event oddballness, novelty P3, nP3), or target-related processes (event targetness, target P3b). To examine this question, the electroencephalogram (EEG) was recorded during a cued task-switching(More)
One of the most common techniques to evaluate the performance of a computer I/O subsystem performance has been found on detailed simulation models including specific features of storage devices like disk geometry, zone splitting, caching, read-ahead buffers and request reordering. However, as soon as a new technological innovation is added, those models(More)
This paper presents a new probabilistic model which describes the way data blocks belonging to a certain file are distributed along the disk in general purpose systems. The distribution type is classified depending on the kind of file system, the file size and the disk occupancy ratio. The resulting algorithm will be used to simulate the access time to the(More)
Energy saving for computing systems has recently become an important and worrying need. Energy demand has been increasing in many systems, especially in data centers and supercomputers. This article considers the problem of saving energy on storage systems taking advantage of SSD drives. SSD and magnetic disk devices offer different power characteristics,(More)
Nowadays, satisfying the global throughput targets of each application in High Performance Computing systems is a difficult task because of the high number of architectural configurations having a considerable impact on the overall system performance, such as the number of storage servers, features of the communication links, number of CPU cores per node,(More)
Traditional approache s for storage devices simulation have been based on detailed and analytic models. However, analytic models are difficult to obtain and detailed models require a high computational cost which may be not af fordable for large scale simulations (e.g. detailed data center simulation s). In current systems like large clusters, grids, or(More)
Traditional approaches for storage devices simulation have been based on detailed analytical models. However, detailed models require detailed computations which may be not affordable for large scale simulations. Moreover, highly detailed models cannot be easily generalized. A different approach is the black-box statistical modeling, where the storage(More)