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GRIDPP-STORAGE April 2011
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Subject:
Re: UK FTS channels that don't make the SONAR test
From:
John Bland <[log in to unmask]>
Reply-To:
Date:
Tue, 5 Apr 2011 14:23:32 +0100
Content-Type:
text/plain
Parts/Attachments:
text/plain (81 lines)
Hi, What are the generally accepted TCP Window sizes these days? We may have missed a tweak somewhere. Or we might have to take it up with the uni network guys. John On 05/04/2011 13:40, [log in to unmask] wrote: > So the following channels are those which would not make the 10MB/s for > atlas transfers are in the following channels: > > http://bourricot.cern.ch/dq2/ftsmon/channel_view/multi/UKI-SOUTHGRID-BHAM-HEP&UKI-NORTHGRID-LIV-HEP&UKI-NORTHGRID-SHEF-HEP&RAL-LCG2&UKI-SCOTGRID-DURHAM&UKI-LT2-RHUL&UKI-LT2-UCL-HEP&RAL-LCG2&RAL-LCG2&RAL-LCG2/RAL-LCG2&RAL-LCG2&RAL-LCG2&UKI-NORTHGRID-LIV-HEP&RAL-LCG2&RAL-LCG2&RAL-LCG2&UKI-LT2-RHUL&UKI-LT2-UCL-HEP&UKI-SCOTGRID-GLASGOW/2011-03-01/2011-04-05/19/ > <http://bourricot.cern.ch/dq2/ftsmon/channel_view/multi/UKI-SOUTHGRID-BHAM-HEP&UKI-NORTHGRID-LIV-HEP&UKI-NORTHGRID-SHEF-HEP&RAL-LCG2&UKI-SCOTGRID-DURHAM&UKI-LT2-RHUL&UKI-LT2-UCL-HEP&RAL-LCG2&RAL-LCG2&RAL-LCG2/RAL-LCG2&RAL-LCG2&RAL-LCG2&UKI-NORTHGRID-LIV-HEP&RAL-LCG2&RAL-LCG2&RAL-LCG2&UKI-LT2-RHUL&UKI-LT2-UCL-HEP&UKI-SCOTGRID-GLASGOW/2011-03-01/2011-04-05/19/> > > so these are > > ral-Liverpool > > Liverpool-ral > > ral-RHUL > > RHUL-ral > > ucl-ral > > ral-ucl > > Birmingham-ral > > Durham-ral > > ral-Glasgow > > For Liverpool, RHUL and ucl its bi-directional > > But for Birmingham Durham and Glasgow its single directional. > > Glasgow is an interesting issue. > > On the 25^th we increased from 5 to 20 concurrent transfers due to clear a > backlog of files. For two weeks before the channel average was 11.0 MB/s but > two weeks after it is 7.1 MB/s ( so now failing) this can be seen in these > two plots: > > Before > > http://bourricot.cern.ch/dq2/ftsmon/multi_spacetoken_view/RAL-LCG2/UKI-SCOTGRID-GLASGOW/2011-03-11/2011-03-25/12/0/1/ > > After > > http://bourricot.cern.ch/dq2/ftsmon/multi_spacetoken_view/RAL-LCG2/UKI-SCOTGRID-GLASGOW/2011-03-25/2011-04-08/12/0/1/ > > I see this as possible evidence that number of concurrent files is a factor > > An url to compare bi-directional can be seen here: > > Durham is here: > > http://bourricot.cern.ch/dq2/ftsmon/channel_view/multi/RAL-LCG2&UKI-SCOTGRID-DURHAM/UKI-SCOTGRID-DURHAM&RAL-LCG2/2011-03-11/2011-04-25/24/ > <http://bourricot.cern.ch/dq2/ftsmon/channel_view/multi/RAL-LCG2&UKI-SCOTGRID-DURHAM/UKI-SCOTGRID-DURHAM&RAL-LCG2/2011-03-11/2011-04-25/24/> > > Liverpool is here: > > http://bourricot.cern.ch/dq2/ftsmon/channel_view/multi/RAL-LCG2&UKI-NORTHGRID-LIV-HEP/UKI-NORTHGRID-LIV-HEP&RAL-LCG2/2011-03-11/2011-04-25/24/ > <http://bourricot.cern.ch/dq2/ftsmon/channel_view/multi/RAL-LCG2&UKI-NORTHGRID-LIV-HEP/UKI-NORTHGRID-LIV-HEP&RAL-LCG2/2011-03-11/2011-04-25/24/> > > Brian > -- John Bland [log in to unmask] System Administrator office: 220 High Energy Physics Division tel (int): 42911 Oliver Lodge Laboratory tel (ext): +44 (0)151 794 2911 University of Liverpool http://www.liv.ac.uk/physics/hep/ "I canna change the laws of physics, Captain!"
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