Search results for "Metadata"
showing 10 items of 117 documents
Towards Dynamic Scripted pNFS Layouts
2012
Today's network file systems consist of a variety of complex subprotocols and backend storage classes. The data is typically spread over multiple data servers to achieve higher levels of performance and reliability. A metadata server is responsible for creating the mapping of a file to these data servers. It is hard to map application specific access patterns to storage system specific features, which can result in a degraded IO performance. We present an NFSv4.1/pNFS protocol extension that integrates the client's ability to provide hints and I/O advices to metadata servers. We define multiple storage classes and allow the client to choose which type of storage fits best for its desired ac…
A methodology to compare and adapt e-learning in the global context
2010
In this paper, we present a solution how to test cultural influences on E-Learning in a global context. Based on a metadata approach, we show how specifically cultural influence factors can be determined to transfer and adapt learning environments. We present a method how those influence factors can be validated for both, to improve the dynamical meta-data specification and to be used in the development of (international) E-Learning scenarios.
On How to Build SDI Using Social Networking Principles in the Scope of Spatial Planning and Vocational Education
2011
Several ways how to build a spatial data infrastructure usable for spatial planning domain exist. It must be said that today the area of spatial planning is under the influence of the European INSPIRE directive. It is necessary to spread an awareness about how to build this infrastructure in terms of INSPIRE. The article describes the current ways how to build the spatial data infrastructure. Furthermore, a new approach - GeoPortal4everybody, based also on using of social networking principles is proposed. Next, the paper presents using of GeoPortal4everybody concept as a part of technological framework for vocational education partially developed in the SDI-EDU project. This project aims o…
ADA-FS—Advanced Data Placement via Ad hoc File Systems at Extreme Scales
2020
Today’s High-Performance Computing (HPC) environments increasingly have to manage relatively new access patterns (e.g., large numbers of metadata operations) which general-purpose parallel file systems (PFS) were not optimized for. Burst-buffer file systems aim to solve that challenge by spanning an ad hoc file system across node-local flash storage at compute nodes to relief the PFS from such access patterns. However, existing burst-buffer file systems still support many of the traditional file system features, which are often not required in HPC applications, at the cost of file system performance.
Using On-Demand File Systems in HPC Environments
2019
In modern HPC systems, parallel (distributed) file systems are used to allow fast access from and to the storage infrastructure. However, I/O performance in large-scale HPC systems has failed to keep up with the increase in computational power. As a result, the I/O subsystem which also has to cope with a large number of demanding metadata operations is often the bottleneck of the entire HPC system. In some cases, even a single bad behaving application can be held responsible for slowing down the entire HPC system, disrupting other applications that use the same I/O subsystem. These kinds of situations are likely to become more frequent in the future with larger and more powerful HPC systems…
One Phase Commit: A Low Overhead Atomic Commitment Protocol for Scalable Metadata Services
2012
As the number of client machines in high end computing clusters increases, the file system cannot keep up with the resulting volume of requests, using a centralized metadata server. This problem will be even more prominent with the advent of the exascale computing age. In this context, the centralized metadata server represents a bottleneck for the scaling of the file system performance as well as a single point of failure. To overcome this problem, file systems are evolving from centralized metadata services to distributed metadata services. The metadata distribution raises a number of additional problems that must be taken into account. In this paper we will focus on the problem of managi…
Simurgh
2021
The availability of non-volatile main memory (NVMM) has started a new era for storage systems and NVMM specific file systems can support extremely high data and metadata rates, which are required by many HPC and data-intensive applications. Scaling metadata performance within NVMM file systems is nevertheless often restricted by the Linux kernel storage stack, while simply moving metadata management to the user space can compromise security or flexibility. This paper introduces Simurgh, a hardware-assisted user space file system with decentralized metadata management that allows secure metadata updates from within user space. Simurgh guarantees consistency, durability, and ordering of updat…
Recognition and qualifications frameworks
2009
The purpose of this article is to consider the effects of the currently emerging qualifications frameworks upon the recognition of qualifications within the European Higher Education Area. We will ...
An Approach Towards Information Quality Management of Electronic Health Records
2014
Electronic Health Records (EHR) management systems, have gained attention in many countries as public organizations working in health domain (such as hospitals and municipalities) use them to lift the quality of health care. EHRs are considered as the basis for establishing Health Information Service (HIS) systems. In spite of remarkable advantages of EHRs, the lack of quality metrics can reduce the efficiency of high level systems that are based on them. Particularly, it is smart to design a mechanism to assure the quality of data generated by sensors. In this paper, we propose an architecture in which EHRs are enriched with metadata to provide the information quality. Our architecture emp…
Skill-Based Scouting of Open Management Content
2010
Already existing open educational resources in management have a high potential for enterprises to address the increasing training needs of their employees. However, access barriers still prevent the full exploitation of this potential. Users have to search a number of repositories with heterogeneous interfaces in order to retrieve the desired content. In addition, the use of search criteria related to skills, such as learning objectives and skill-levels is in most cases not supported. The demonstrator presented in this paper addresses these shortcomings by federating multiple repositories, integrating and enriching their metadata, and employing skill-based search for management related con…