Mar 21 – 27, 2009
Europe/Prague timezone

Improving data distribution on disk pools for dCache

Mar 26, 2009, 8:00 AM


Prague Congress Centre 5. května 65, 140 00 Prague 4, Czech Republic
Board: Thursday 037
poster Grid Middleware and Networking Technologies Poster session


Dr Christopher Jung (Forschungszentrum Karlsruhe)


Most Tier-1 centers of LHC Computing Grid are using dCache as their storage system. dCache uses a cost model incorporating CPU and space costs for the distribution of data on its disk pools. Storage resources at Tier-1 centers are usually upgraded once or twice a year according to given milestones. One of the effects of this procedure is the accumulation of heterogeneous hardware resources. For a dCache system a heterogeneous set of disk pools complicates the process of weighting CPU and space costs for an efficient distribution of data. The German Tier-1, GridKa, has decided to optimize its weighing of the costs by simulating the data transfers to and from its disk pools. This software focuses on these pools which receive the data from the outside and transfer it to the tape backend, as these particular pools are of importance in data reception from the LHC experiments and as they are a potential bottleneck. This presentation/poster will focus on the results gained from simulation software and how they have been used for optimization at the GridKa Tier-1.

Primary author

Dr Christopher Jung (Forschungszentrum Karlsruhe)


Dr Doris Ressmann (Forschungszentrum Karlsruhe) Dr Silke Halstenberg (Forschungszentrum Karlsruhe)

Presentation materials