Category: Service
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UI / WN
The User Interface (UI) is the access point to the Grid Infrastructure. This can be any machine where users have personal account and where their user certificate is installed. From the UI, the user can be authenticated and authorised to use the Grid resources and can access the functionalities offered by the Information, Workload and
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Batch Systems
The following documentation mainly covers existing batch system middleware integration components and some general links to the most popular batch systems used within WLCG. In particular, ARC and CREAM CE integration with HTCondor, Slurm, Torque, LSF and Grid Engine flavors are well documented.
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XRootD
XRootD software framework is a fully generic suite for fast, low latency and scalable data access, which can serve natively any kind of data, organized as a hierarchical filesystem-like namespace, based on the concept of directory.
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GFAL
GFAL (Grid File Access Library ) is a client C library providing an abstraction layer of the grid storage system complexity.
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HTCondor CE (OSG)
An OSG Compute Element (CE) is the entry point for the OSG to your local resources: a layer of software that you install on a machine that can submit jobs into your local batch system. At the heart of the CE is the job gateway software, which is responsible for handling incoming jobs, authorizing them,
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Argus
The Argus Authorization Service renders consistent authorization decisions for distributed services (e.g., portals, computing elements, storage elements). The service is based on the XACML standard and uses authorization policies to determine if a user is allowed or denied to perform a certain action on a particular service.
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VOMS
The Virtual Organization Membership Service is a Grid attribute authority which serves as central repository for VO user authorization information, providing support for sorting users into group hierarchies and keeping track of their roles and other attributes. Such information is used to issue trusted attribute certificates and assertions used in the Grid environment for authorization
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FTS
FTS3 is the service responsible for globally distributing the majority of the LHC data across the WLCG infrastructure. It is a low level data movement service, responsible for reliable bulk transfer of files from one site to another while allowing the network resource usage to be controlled per site.
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EOS
EOS is a disk-based service providing a low latency storage infrastructure for end users. EOS provides a highly-scalable hierarchical namespace implementation. Data access is provided by the XROOT and HTTPS protocols.
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CVMFS
CERNVM File System (CVMFS) is a network file system based on HTTP and optimized to deliver experiment software in a fast, scalable, and reliable way. Files and file metadata are aggressively cached and downloaded on demand.