[Halld-offline] expected bandwidth offsite

[Shepherd, Matthew]

Hi Sandy,

(cc'ed to offline list in case anyone also cares about this topic or has input.)

I copied about 10 TB of GlueX data (a calibration skim) from JLab to our machine here at Indiana.  I used the web-based globus-connect system.  

The source at JLab was:

expphy/cache/halld/home/gxproj3/calib/GlueX-CalibRun-2016-04-04/

The transfer took about 2.5 days (5/12 - 5/14) and when complete I had averaged 49 MB/s.

49 MB/s (roughly 400 Mb/s) is not too shabby, but I'd like to know what you think we might be able to get going offsite.

Here, we've got 10 gigabit everywhere:  fiber coming into a switch and then into 10 gigabit interface cards.  Some informal local testing has produced speeds in the neighborhood of about 3-4 Gb/s, roughly ten times what I got from JLab.  However, that doesn't necessarily rule out a bottleneck somewhere outside the lab.

The transfer rate is acceptable, but I thought I'd ask in case there is some obvious things we can do to get a few factors speed up.  

Matt

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Matthew Shepherd, Associate Professor
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