So as part of the Storage evolution within the UK, the Birmingham site is switching SEs from DPM to EOS for the ATLAS experiment. However this blog isn't about that, this blog is about what is happening in the meantime... Similar to the way in which we pointed UCL WNs to use QMUL storage in London, ATLAS have switched the 'Brum' WNs to use storage at Manchester. This "greatly" increases the rtt between WN and SE from ~0.1ms to ~4ms. So I got to wandering, is this increase in latency noticeable in Job efficiency for the VOs. Here are the graphs from the VO for Birmingham and Manchester for the last month..
For Manchester a a control set for SE performance we have:
And for Birmingham we have:
I leave it to the reader to come to conclusions about wether Birmingham efficiencies have dropped since changing SEs. (Even if that conclusion is "you need more data to make a proper comparison",) but at least its something to get things going...
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