Report from Task1

• Simon Casey

Simon: Further work with libvma gave good results with small packets. Found that receive was faster than transmit - this was due to Turbo Boost being activated on Receive but not transmit. Scaling was in "Power Save" not "Performance". Richard: Upgraded GÉANT DTN-1 and DTN-2 to use ConnectX5 NICs and 100GBASE-LR4. Still see drop in UDP throughput at 7813 Bytes. Also several % packet loss due to NIC rx_out_of_buffer. Fixed by setting RX ring to 4096 or 8192. Experiment with libvma parameters to improve UDP receive. Issue with iperf3 TCP not using libvma on receive. Oleg: As promised here is some links about xrootd protocol, however xrootd came from HE physic and deeply integrated to the another tools mainly "root framework" (https://root.cern.ch/) and special CMSSW ( CMS experiment SoftWare framework). The the brief background about xrootd you can find in the slides G. DONVITO : http://www.desy.de/dvsem/WS1112/donvito_talk.pdf and xrootd redirection well explained : https://twiki.cern.ch/twiki/bin/view/Main/RedirectorsSubscription He has set up an xrootd end point but others are needed for tests. Julich has the LOFAR LTA (Long Term Archive) running in production. If is running on dCache instance with enabled protocols: GridFTP, SRM, http/https, NFS4.1, based on 8 servers each with 10G network interface and has total 300 TB disk space. The LTA is placed in local DMZ . LOFAR uses SRM and gridftp, but SRM can use either gridftp or xrootd. Action: Oleg to put a diagram on LOFAR at Julich on the wiki. Action: All identify other WP4 nodes to num xrootd. Action: Introduce Oleg and people at RAL.

Report from Task 2

• Mauro Nanni

Mauro: Written to Michiel van Haarlem WP2 two months ago about the technical survey. only just received a reply. There was an AENEAS meeting in Italy on how to collect the required information. Issue is that questions from some WP, e.g. WP5, are directed to the Astronomical community not the (site) infrastructure providers. It is still best to coordinate questions to the centers and we will include Julich.

Report from Task 3

• Richard Hughes-Jones (GEANT)

Report from Task 4

• Richard Hughes-Jones (GEANT)

Siju: The new 10 Gig lambda link from South Africa is expected to be ready for tests on 12 August17. MeerKAT has one 10 Gig link from the Karroo to Cape Town. Action: Siju & Richard Make network diagrams of the link connectivity in SA and UK.

Date of next Telcon 7 August 2017

AOB Agreement that it would be useful to have a joint Telcon with WP3 at the start of September. Action: Richard to investigate.