G. Cancio
(CERN)
27/09/2004, 14:00
Track 6 - Computer Fabrics
oral presentation
This paper describes the evolution of fabric management at CERN's T0/T1 Computing
Center, from the selection and adoption of prototypes produced by the European
DataGrid (EDG) project[1] to enhancements made to them.
In the last year of the EDG project, developers and service managers have been
working to understand and solve operational and scalability issues.
CERN has adopted and...
Tomasz WLODEK
(BNL)
27/09/2004, 14:20
Track 6 - Computer Fabrics
oral presentation
This presentation describes the experiences and the
lessons learned by the RHIC/ATLAS Computing Facility
(RACF) in building and managing its 2,700+ CPU (and growing)
Linux Farm over the past 6+ years. We describe how
hardware cost, end-user needs, infrastructure,
footprint, hardware configuration, vendor selection,
software support and other considerations have
played a role in...
Don Petravick
27/09/2004, 14:40
Track 6 - Computer Fabrics
oral presentation
As part of the DOE SciDAC "National Infrastructure for Lattice Gauge
Computing" project, Fermilab builds and operates production clusters for
lattice QCD simulations. We currently operate three clusters: a 128-node dual
Xeon Myrinet cluster, a 128-node Pentium 4E Myrinet cluster, and a 32-node
dual Xeon Infiniband cluster. We will discuss the operation of these systems
and examine their...
S. Thorn
27/09/2004, 15:00
Track 6 - Computer Fabrics
oral presentation
ScotGrid is a prototype regional computing centre formed as a collaboration between
the universities of Durham, Edinburgh and Glasgow as part of the UK's national
particle physics grid, GridPP. We outline the resources available at the three core
sites and our optimisation efforts for our user communities. We discuss the work
which has been conducted in extending the centre to embrace new...
J. Rodriguez
(UNIVERSITY OF FLORIDA)
27/09/2004, 15:20
Track 6 - Computer Fabrics
oral presentation
The High Energy Physics Group at the University of Florida is involved in a variety
of projects ranging from High Energy Experiments at hadron and electron positron
colliders to cutting edge computer science experiments focused on grid computing.
In support of these activities members of the Florida group have developed and
deployed a local computational facility which consists of...
S. Canon
(NATIONAL ENERGY RESEARCH SCIENTIFIC COMPUTING CENTER)
27/09/2004, 15:40
Track 6 - Computer Fabrics
oral presentation
Supporting multiple large collaborations on shared compute
farms has typically resulted in divergent requirements from the
users on the configuration of these farms. As the frameworks used
by these collaborations are adapted to use Grids, this issue will likely
have a significant impact on the effectiveness of Grids.
To address these issues, a method was developed at Lawrence Berkeley...
P. DeMar
(FNAL)
27/09/2004, 16:30
Track 6 - Computer Fabrics
oral presentation
Management of large site network such as FNAL LAN presents many
technical and organizational challenges. This highly dynamic network
consists of around 10 thousand network nodes. The nature of the
activities FNAL is involved in and its computing policy
require that the network remains as open as reasonably possible
both in terms of connectivity to the outside networks and in with
respect...
J. VanWezel
(FORSCHUNGZENTRUM KARLSRUHE)
27/09/2004, 16:50
Track 6 - Computer Fabrics
oral presentation
The HEP experiments that use the regional center GridKa will handle
large amounts of data. Traditional access methods via local disks or
large network storage servers show limitations in size, throughput or
data management flexibility.
High speed interconnects like Fibre Channel, iSCSI or Infiniband as
well as parallel file systems are becoming increasingly important in
large cluster...
O. Tatebe
(GRID TECHNOLOGY RESEARCH CENTER, AIST)
27/09/2004, 17:10
Track 6 - Computer Fabrics
oral presentation
Gfarm v2 is designed for facilitating reliable file sharing and
high-performance distributed and parallel data computing in a Grid
across administrative domains by providing a Grid file system. A
Grid
file system is a virtual file system that federates multiple file
systems. It is possible to share files or data by mounting the
virtual file system. This paper discusses the design...
Y. CHENG
(COMPUTING CENTER,INSTITUTE OF HIGH ENERGY PHYSICS,CHINESE ACADEMY OF SCIENCES)
27/09/2004, 17:30
Track 6 - Computer Fabrics
oral presentation
With the development of Linux and improvement of PC's performance, PC cluster used
as high performance computing system is becoming much popular. The performance of
I/O subsystem and cluster file system is critical to a high performance computing
system. In this work the basic characteristics of cluster file systems and their
performance are reviewed. The performance of four...
T. Mkrtchyan
(DESY)
27/09/2004, 17:50
Track 6 - Computer Fabrics
oral presentation
After successful implementation and deployment of the dCache system
over the last years, one of the additional required services, the
namespace service, is faced additional and completely new
requirements. Most of these are caused by scaling the system, the
integration with Grid services and the need for redundant (high
availability) configurations. The existing system, having only...
T. Smith
(CERN)
29/09/2004, 14:00
Track 6 - Computer Fabrics
oral presentation
This paper discusses the challenges in maintaining a stable Managed Storage Service
for users built upon dynamic underlying disk and tape layers.
Early in 2004 the tools and techniques used to manage disk, tape, and stage servers
were refreshed in adopting the QUATTOR tool set. This has markedly increased the
coherency and efficiency of the configuration of data servers. The LEMON...
A. Moibenko
(FERMI NATIONAL ACCELERATOR LABORATORY, USA)
29/09/2004, 14:20
Track 6 - Computer Fabrics
oral presentation
Fermilab has developed and successively uses Enstore Data Storage
System. It is a primary data store for the Run II Collider Experiments,
as well as for the others. It provides data storage in robotic tape libraries
according to requirements of the experiments. High fault tolerance and
availability, as well as multilevel priority based request processing
allows experiments to effectively...
H. Meinhard
(CERN-IT)
29/09/2004, 14:40
Track 6 - Computer Fabrics
oral presentation
By 2008, the T0/T1 centre for the LHC at CERN is estimated to use
about 5000 TB of disk storage. This is a very significant increase
over the about 250 TB running now. In order to be affordable, the
chosen technology must provide the required performance and at the
same time be cost-effective and easy to operate and use.
We will present an analysis of the cost (both in terms of...
S. Wiesand
(DESY)
29/09/2004, 15:00
Track 6 - Computer Fabrics
oral presentation
64-Bit commodity clusters and farms based on AMD technology meanwhile have been
proven to achieve a high computing power in many scientific applications. This report
first gives a short introduction into the specialties of the amd64 architecture and
the characteristics of two-way Opteron systems.
Then results from measuring the performance and the behavior of such systems in
various...
S. Jarp
(CERN)
29/09/2004, 15:20
Track 6 - Computer Fabrics
oral presentation
For the last 18 months CERN has collaborated closely with several industrial partners
to evaluate, through the opencluster project, technology that may (and hopefully
will) play a strong role in the future computing solutions, primarily for LHC but
possibly also for other HEP computing environments. Unlike conventional field testing
where solutions from industry are evaluated rather...
A. Heiss
(FORSCHUNGSZENTRUM KARLSRUHE)
29/09/2004, 15:40
Track 6 - Computer Fabrics
oral presentation
Distributed physics analysis techniques as provided by the rootd
and proofd concepts require a fast and efficient interconnect between
the nodes. Apart from the required bandwidth the latency of message
transfers is important, in particular in environments with many nodes.
Ethernet is known to have large latencies, between 30 and 60 micro seconds for
the common Giga-bit Ethernet.
The...
J-D. Durand
(CERN)
29/09/2004, 16:30
Track 6 - Computer Fabrics
oral presentation
The Cern Advanced STORage (CASTOR) system is a scalable high throughput
hierarchical storage system developed at CERN. CASTOR was first deployed
for full production use in 2001 and has expanded to now manage around two
PetaBytes and almost 20 million files. CASTOR is a modular system,
providing a distributed disk cache, a stager, and a back end tape archive,
accessible via a global...
P. Fuhrmann
(DESY)
29/09/2004, 16:50
Track 6 - Computer Fabrics
oral presentation
The dCache software system has been designed to manage a
huge amount of individual disk storage nodes and let them
appear under a single file system root. Beside a variety
of other features, it supports the GridFtp dialect, implements
the Storage Resource Manager interface (SRM V1) and can be linked
against the CERN GFAL software layer. These abilities makes
dCache a perfect Storage...
T. Perelmutov
(FERMI NATIONAL ACCELERATOR LABORATORY)
29/09/2004, 17:10
Track 6 - Computer Fabrics
oral presentation
Storage Resource Managers (SRMs) are middleware components whose function is to
provide dynamic space allocation and file management on shared storage components on
the Grid. SRMs support protocol negotiation and reliable replication mechanism. The
SRM standard allows independent institutions to implement their own SRMs, thus
allowing for a uniform access to heterogeneous storage...
Y. Iida
(HIGH ENERGY ACCELERATOR RESEARCH ORGANIZATION)
29/09/2004, 17:30
Track 6 - Computer Fabrics
oral presentation
The Belle experiment has accumulated an integrated luminosity of more than 240fb-1
so far, and a daily logged luminosity now exceeds 800pb-1. These numbers correspond
to more than 1PB of raw and processed data stored on tape and an accumulation of
the raw data at the rate of 1TB/day. The processed, compactified data, together
with Monte Carlo simulation data for the final physics...
L. Magnoni
(INFN-CNAF)
29/09/2004, 17:50
Track 6 - Computer Fabrics
oral presentation
Within a Grid the possibility of managing storage space is fundamental, in
particular, before and during application execution. On the other hand, the
increasing availability of highly performant computing resources raises the need for
fast and efficient I/O operations and drives the development of parallel distributed
file systems able to satisfy these needs granting access to distributed...
S. Veseli
(Fermilab)
29/09/2004, 18:10
Track 6 - Computer Fabrics
oral presentation
The SAMGrid Database Server encapsulates several important services, such as
accessing file metadata and replica catalog, keeping track of the processing
information, as well as providing the runtime support for SAMGrid station
services. Recent deployment of the SAMGrid system for CDF has resulted in
unification of the database schema used by CDF and D0, and the complexity
of changes...
