1. DORII Infrastructure - General Information
   1. Instrument Resources
   2. Virtual Organizations
   3. Instrument Integration
   4. Sites of Computational and Storage Resources
   5. Operational Tools
2. Information for Users
3. Information for Site Administrators
4. The DORII Network Infrastructure

DORII applications require the integration of scientific instruments with computational and storage resources to facilitate data acquisition, storage and processing. Coordinated and secure access to instruments, data and computational resources is an important requirement for the effective remote usage of these instruments by the application and their users. To fulfil the above requirements the DORII project utilizes the capabilities of Grid infrastructures. The main principle is the use of existing e-Infrastructures in Europe adding the necessary components and services to facilitate remote instrumentation. The DORII eInfrastructure is mainly based on the EGEE (Enabling Grids for E-sciencE) [http://www.eu-egee.org] infrastructure and its middleware of choice gLite (http://glite.web.cern.ch/glite/). The middleware service dealing with the management of remote instrumentation is the Instrument Element (IE) that is being built by the DORII project. To deal with the interactivity requirements of the applications the DORII eInfrastructure deploys a selection of services built by the Interactive European Grid Project (int.eu.grid) [http://www.interactive-grid.eu]. The first version of the DORII e-Infrastructure is comprised of resource centres (sites) that are distributed among the partners of the project in several countries such as Germany, Greece, Italy, Poland and Spain. Several of them belong to the EGEE infrastructure while others are new sites operated by the DORII partners and supporting the DORII Virtual Organizations. Initial deployment of the applications is being done inside the Catch-All vo.dorii.eu VO. Today, while some applications continue to use this Catch-All VO, some others have migrated to their own VOs. In total, 10 resource centres are already available in the DORII infrastructure in its first version, providing more than 2300 non-dedicated CPUs and several Terabytes of storage.

* IFCA-CSIC and IFCA-I2G sites share the same resources.

• User Registration
• Getting Access to the Virtual Control Room (VCR)
• User Support

• Adding Support for vo.dorii.eu to sites
• Instrument Element Deployment
• Accounting for Instrument Elements

The DORII networking infrastructure is based on three main component networks:

• Local Area Networks of the participating institutions, including highly heterogeneous data collection parts (sensor networks, satellite links, ADSL, high-speed data transfer)
• NRENs, providing access to each national research network and to the Internet
• GÉANT, as the backbone interconnecting NRENs

The basic DORII network infrastructure is reported in the following figure and and has been extensively discussed in DSA1.1, DSA1.2. Since the network infrastructure is used as is, i.e., in an “Internet-like” fashion, only a best effort packet delivery service is provided.

The figure also highlights the location of the clients and servers deployed to monitor the available bandwidth and the Round-Trip Time (RTT), by using Pathload and Smokeping, respectively.

The task of the networking Service Activity was to ensure that the necessary connectivity be present, to identify service interruptions and bottlenecks, and to maintain QoS (and, consequently, users’ QoE) within acceptable limits, identified by the specific application requirements. To this end, deliverables DSA1.1, DSA1.2 and DSA1.3 identified application requirements, evaluated early applications’ deployment, and defined a roadmap for the setup of a monitoring infrastructure, capable of reporting potential bottlenecks and the ensuing performance degradation in the quality of the user applications. The monitoring infrastructure allows measuring well-defined metrics.

To evaluate the performance of a sub-set of DORII applications (one for each scientific community) when QoS is provided, a dedicated bandwidth connection at 1 Gb/s between PSNC and GRNET (see the following figure) has been set-up for experimental purposes. The dedicated bandwidth connection was provided from GÉANT through the GÉANT Plus Connectivity Service. For the purposes of the test, point-to-point dedicated 1Gbps connectivity was established between marie.hellasgrid.gr (SE) and reef.man.poznan.pl (CE). Traffic generated from marie.hellasgrid.gr towards reef.man.poznan.pl was routed through the dedicated point-to-point connection. Similarly, traffic generated from reef.man.poznan.pl towards marie.hellasgrid.gr was routed through the dedicated point-to-point connection. All the other traffic of both sites was routed through the existing network in GRNET and PSNC and did not affect the dedicated bandwidth circuit.

Within the DORII network native IPv6 connectivity is provided between GRNET and PSNC through the GRNET and PIONEER networks that are connected through the GÉANT2 network. Furthermore, an IPv6 Testbed is set-up within EUCENTRE and a HellasGrid site in GRNET. Native IPv6 connectivity has been enabled in the access network for EUCENTRE and ariagni.hellasgrid.gr that is a HellasGrid site in Crete. In EUCENTRE, IPv6 is supported in the EUCENTRE LAN, the hosting IE and the VCR, while in ariagni.hellasgrid.gr IPv6 is supported in all the hosts of the Grid site. IPv6 connection between EUCENTRE and ariagni.hellasgrid.gr is provided through the native IPv6 network of GRNET, GÉANT and GARR. The topology of the connection is shown in the following figure.

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EUCENTRE application is written in Java and thus IPv6 is transparently supported for this application. However, since the gLite middleware is partially ported to IPv6 at this moment, we were not able to execute tests with IPv6 to the HellasGrid sites. Thus, in order to make some pilot tests with IPv6 support, by using the DORII developed middleware, a special IPv6 enabled testbed is being created. In this testbed, an IPv6 enabled VCR is installed in GRNET in order to be accessible via IPv6 from the IE in EUCENTRE.

More specifically, native IPv6 connectivity has been enabled between EUCENTRE and GRNET:

• EUCENTRE LAN, hosting the IE
• Italian NREN (GARR)
• GÉANT
• Greek NREN (GRNET), hosting a VCR that supports IPv6, SEs and CEs

You can access the network monitoring tools of the DORII infrastructure from here