Saturday, October 21, 2006

The Glasgow DPM has been tested by Jamie last week.

The summary is:

The i/o and network internal to the cluster is working very, very well. When we patched a direct link across from grid08 (as the source SE), we got a rate of 800+Mb/s. This with only 3 of our 10 new disk servers. (These were transfers managed by FTS, so exercising the full data transfer hierarchy.)

However, the network rate from within, and without, the university seems to be very low. iperf tests from the PPE research network to the new cluster struggle to reach 300Mb/s. From outside we seem to only reach 150Mb/s.

Because of the excellent test above, we are convinced that the problem is the networking on the campus backbone.

We have raised this issue with the network team in the university, but have yet to get a response.

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