Speaker
Dr
Gerd Behrmann
(Nordic Data Grid Facility)
Description
The LCG collaboration is encompased by a number of Tier 1 centers. The nordic LCG
Tier 1 is in contrast to other Tier 1 centers distributed over most of Scandinavia. A
distributed setup was chosen for both political and technical reasons, but also
provides a number of unique challenges. dCache is well known and respected as a
powerfull distributed storage resource manager, and was chosen for implementing the
storage aspects of the nordic Tier 1. In contrast to classic dCache deployments, we
deploy dCache over a WAN with limitted bandwith, high latency, frequent network
failures, and spanning many administrative domains. These properties provide unique
challenges, covering topics such as security, administration, maintenance,
upgradability, reliability, and performance. Our initial focus has been on
implementing the GridFTP 2 OGF recommendation in dCache and the Globus Toolkit.
Compared to GridFTP 1, GridFTP 2 allows for more intelligent data flow between
clients and storage pools, thus enabling more efficient use of our limitted bandwith.
Future efforts will address other issues, such as reliability in case of network
separation.
Authors
Dr
Gerd Behrmann
(Nordic Data Grid Facility)
Dr
Josva Kleist
(Nordic Data Grid Facility)
Dr
Patrick Fuhrmann
(Deutsches Elektronen-Synchrotron DESY)
