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Distributed Storage for Communities

dCache-Server and ES6600-StorageSource: FZ Jülich

SATA DiskSource: FZ Jülich

SL8500 LibrarySource: FZ Jülich

SL8500 CartridgeSource: FZ Jülich

EUDAT ServerSource: FZ Jülich

Two datamangement systems to store distributed data - dCache and iRODS - are available.

dCache-System


dCache is a disk pool management system with a SRM interface, jointly developed by DESY and Fermilab. It provides access to data by an uniform filesystem that can be distributed over serveral servers. One of the advantages of using dCache to manage a sites storage resources is that it can act as a front end disk cache behind which sits some hierarchical storage system, such as a tape robot.

iRODS-System

iRODS Integrated Rule-Oriented Data System, is a data grid software system developed by the Data Intensive Cyber Environments research group and collaborators. The iRODS system is based on expertise gained through a decade of applying the SRB technology in support of Data Grids, Digital Libraries, Persistent Archives, and Real-time Data Systems.

These systems are used by three user communities


dCache-System for ILDG

The first dCache-System at the Forschungszentrum Jülich GmbH is used by the ILDG (International Lattice Data-Grid) group for storing and analysis of QCD simulation data.

Hardware Characteristics
  • 2 Pool nodes and 1 Head node with 2 processors (16 cores)

    • Node: AMD Opteron 2.0 GHz
    • Main memory: 3 x 32 GB (aggregate 96 GB)
    • Network: 3 x 1 Gigabit Ethernet
    • Operating system: Scientific Linux 5.5

  • Disk capacity for cache data: 3 TB
  • Tape storage capacity reserved for ILDG and D-Grid: 600 TB

  • Head node address: dcache.fz-juelich.de

dCache-System for LOFAR

The second dCache-System is part of the LOFAR Long term Archive System. LOFAR is a real-time multiple sensor array which aims to force a breakthrough in sensitivity for astronomical observations at radio-frequencies below 250 MHz. It is being developed by a consortium of institutes, universities and industrial parties, led by ASTRON. The participating German institutes are organized in the GLOW Consortium.

Hardware Characteristics
  • 4 Pool nodes with 8 processors (32 cores)

    • Node: AMD Opteron 1.2 GHz
    • Main memory: 2 x 16 GB, 2 x 32 GB (aggregate 96 GB)
    • Network: 4 x 10 Gigabit Ethernet
    • Operating system: Scientific Linux 5.3
  • 2 Pool nodes with 8 processors (32 cores)

    • Node: Intel Xeon 1.8 GHz
    • Main memory: 2 x 32 GB (aggregate 64 GB)
    • Network: 2 x 10 Gigabit Ethernet
    • Operating system: Scientific Linux 6.3
  • 1 Head node with 2 processors (4 cores)

    • Node: Intel Xeon 2.8 Ghz
    • Main memory: 4 GB
    • Network: 2 x 1 Gigabit Ethernet
    • Operating system: Scientific Linux 5.3

  • 1 Download-Server for HTTP-Acces

    • Node: AMD Opteron 2 GHz
    • Main memory: 32 GB
    • Network: 2x1 Gigabit Ethernet
    • Operating system: Scientific Linux 5.3
  • Disk capacity for cache data: 240 TB
  • Tape storage capacity reserved for LOFAR: 2.5 PB

  • Head node address: dcache-lofar.fz-juelich.de

iRODS-System for EUDAT

The EUDAT vision is to support a Collaborative Data Infrastructure which will allow researchers to share data within and between communities and enable them to carry out their research effectively. EUDAT aims to provide a solution that will be affordable, trustworthy, robust, persistent and easy to use. JSC is one of the EUDAT data centres and will offer a commutity store realized by iRODS (Integrated Rule-Oriented Data System) which is a community-driven, open source, data grid software solution. For more information see the research project EUDAT.

Hardware Characteristics
  • 4 Pool nodes with 2 processors (16 cores)

    • Node: AMD Opteron 2.0 GHz
    • Main memory: 4 x 32 GB (aggregate 128 GB)
    • Network: 4 x 1 and 4 x 10 Gigabit Ethernet
    • Operating system SLES 11
  • Disk capacity for iRODS data: 72 TB
  • Tape storage capacity reserved for EUDAT: 1 PB


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