Storage management is one of the most important enabling technologies for large-scale scientific investigations.Having to deal with multiple heterogeneous storage and file systems is one of the major bottlenecks in managing, replicating, and accessing files in distributed environments. Storage Resource Managers (SRMs), named after their web services control protocol, provide the technology needed to manage the rapidly growing distributed data volumes, as a result of faster and larger computational facilities. SRMs are Grid storage services providing interfaces to storage resources, as well as advanced functionality such as dynamic space allocation and file management on shared storage systems. They call on transport services to bring files into their space transparently and provide effective sharing of files. SRMs are based on a common specification that emerged over time and evolved into an international collaboration. This approach of an open specification that can be used by various institutions to adapt to their own storage systems has proven to be a remarkable success -the challenge has been to provide a consistent homogeneous interface to the Grid, while allowing sites to have diverse infrastructures.In particular, supporting optional features while preserving interoperability is one of the main challenges we describe in this paper. We also describe using SRM in a large international High Energy Physics collaboration, called WLCG, to prepare to handle the large volume of data expected when the Large Hadron Collider (LHC) goes online at CERN. This intense collaboration led to refinements and additional functionality in the SRM specification, and the development of multiple interoperating implementations of SRM for various complex multicomponent storage systems.
Two key economic questions tend to be asked about the transformation of the Roman world. First, how did Roman fiscal structures continue, disintegrate and transform? Second, how did emerging churches play a role in the redistribution of wealth through new administrative structures to create a new social system, what Ian Wood has called a ‘temple society’? These two processes – one focussing on the continuity or discontinuity of the Roman economic structures and the other on churches within that system – are usually examined separately or assumed to follow, what we call here, a ‘Gallic model’. In this article, we first demonstrate that Wood’s ‘temple society’ is far more complex in its emergence in Italy than in Gaul. Second, we argue that the churches of Italy remained embedded within late Roman fiscal structures, even as they transformed during late antiquity. Fiscal arrangements, examined through the churches of Rome and Ravenna, established churches as ever more central economic actors to the state fiscal system by 600 and shaped their long‐term wealth redistribution process.
Modern discussions of rural labor in Byzantine Egypt (300–700 CE) have been bedevilled by disagreement over the definition of that concept. There are three main competing conceptualizations: (i) Rural labor has been defined in terms of serfdom as a parallel outcome to the emergence of “private” (or feudal) large landowners as opposed to the decline of “public powers”; (ii) Rural labor has been described as “free” since it was based on contractual arrangements (primarily, rent tenancy) and on the payment of a public levy to the state; and (iii) Rural labor has been characterized in terms of exploitation, that is, as the instrument through which landholders (both landowners and tenants) extracted unpaid wealth from the population of producers. Building on a vast literature, this essay seeks to clarify that while the notion of feudal serfdom does not find corroborations in the Byzantine sources, the contractual, tributary, and “exploitative” characterizations of labor were not mutually exclusive, but instead describe different aspects and possible developments of the employer-employee relationships.
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