Tuesday, 10 June 2008

May Data Transfers from CERN: CMS @ CCRC'08

During CCRC'08 May tests CMS tested the reliability and robustness of Data Transfers from CERN to all Tier-1 centers. The main metric was to be able to export data from CERN above nominal rate (600MB/sec) for more than 3 days. The individual metric was satisfied at all Tier-1 centers, except for FZK and FNAL.

For PIC, the importing shared target rated was of about 57 MB/s. PIC was all days over the metric, with some days importing a factor x2 than requested.

It is important that data flows from CERN in a smooth way. From reliability and robustness p.o.v. being 3-4 days over the metric is really bad for data taking as we could be stuck at the CERN overrunning CMS buffers. PIC was always over the metric during the whole month and a comparison to other Tier-1s can be seen on this table.

Last, but not least, the mean May '08 rate CERN->PIC was of 70 MB/s, with an impressive Data Transfer Quality of 90%. The test was successful and quite impressive for PIC indeed!

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