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hepix-ipv6-wg
HEPiX IPv6 Working Group - Zoom meeting - 22 Sep 2021 starting at 16:00 CEST
Notes by Dave Kelsey (chair)
Present: Bruno, Catalin, Costin, Dave, Duncan, Edoardo, Martin, Tim, Pepe (joined late).
Apologies: Andrea, Dimitrios, Francesco, Kars.
1. Dave welcomed all to the meeting. The agenda was agreed with the addition of Edoardo wishing to talk about DHCPv6.
https://indico.cern.ch/event/1079234/
2. Roundtable updates.
Dave reported that he (with lots of help from Andrea) had reported to WLCG Management Board on 27 July and to WLCG GDB on 8 September. The slides shown at the GDB are attached to today's agenda.
Duncan reported - on the question of IPv4 data transfers between IPv6-capable sites - that he had looked into IPv4 transfers between QMUL and Imperial - seems to be worker node configuration for Rucio "local" transfers. Apparently James Walder (ATLAS) is monitoring Rucio downloads.
Bruno. No news.
Martin. The long awaited upgrade of IPv6 at RAL from 10 Gbps to 40 Gbps was done a couple of weeks ago. This only affects data control as main data flow on WN's is IPv4 (WN still IPv4-only). The RAL site core has been upgraded to 100 Gbps. New switches will be deployed soon to connect to the 100G. After that can join LHCONE.
Catalin reported on EGI. FedCloud meetings have started to discuss lack of IPv4 addresses.
Edoardo (CERN). First discussion related to the upcoming two-day meeting on 14/15 Oct. It was agreed that this will again be fully virtual. Edoardo reported on commercial Cloud services. Oracle cannot do IPv6 (except in USA). Azure cloud service has recently become dual-stack capable. Edoardo reported that the IETF discussion on DHCPv6 is of concern - CERN would like DHCPv6 to advertise the router preference. TimC reports on IETF discussions where Google for one still says they will not support DHCPv6 on Android. Tim is interested to understand the CERN usecase and reasons for this (discuss again at next meeting).
Tim reports on packet marking activities in the research networking group with recent work on "Firefly". Shawn had been pushing for packet marking to happen during upcoming data challenge but time is very short for that as the ATLAS and CMS challenges are hapenning right now.
Pepe discussed the problems of the current volcano eruption! PIC is still stuck to 10G. RedIRIS and GEANT hope to fix this limit soon.
Duncan and Tim reported work on 100G tests. There is now a perfSONAR 100G dashboard - its mesh being configured now.
There was discussion on the CMS traffic. Jobs on WNs need to read pileup data at CERN and FNAL via AAA. This is over XrootD so currently not monitored for IPv4 versus IPv6. Thought to be true that more than half of data transfers are via XrootD. Also true for user jobs running at Tier1.
3. Tier1, Tier2, LHCOPN/ONE news.
Nothing new on Tier1. Andrea had updated the Tier2 status recently.
4. IPv6-only testing.
No news from the CERN testbed. Dave reported that Raja had told him of a DUNE/FNAL IPv6-only testbed being planned or perhaps even now deployed? Will invite updates at the October two-day meeting.
5. Upcoming conferences.
HEPiX virtual meeting. 25-29 October 2021. As a HEPiX working group we should give a status report.
Dave will draft an abstract.
ISGC2022. Taipei. Hoping to be an in-person meeting. 20 to 25 March 2022.
We should consider a submission (deadline 15 November).
CHEP2022. Norfolk, Virginia, USA. Hoping to be in person. 16 to 20 May 2022. (note added 12 Oct 2021 - CHEP has now been postponed another year until 2023). We should consider a submission next year (last one was CHEP2019) - deadline was 19 November 2021 but now delayed another year.
6. Plans for October two-day meeting.
Should this be fully virtual or hybrid? Nobody was keen to plan to travel to CERN in next few weeks.
Meeting confirmed as fully virtual. Edoardo will cancel room bookings at CERN. It was also confirmed that
as before this will be two half-days. 14th Oct 2021 will be 15:00 to 17:30 CEST. 15th Oct will be 09:30
to 12:30 CEST (with coffee breaks half way).
We discussed topics for this 2-day meeting. These could include:
Usual updates and roundtable.
Update from RNTWG and packet marking (Shawn or Marian).
Monitoring (ETF and perfSONAR), including 100G dashboard - Marian? Duncan?
IPv6-only testbeds (CERN and DUNE).
Update from USA/DOE and IPv6-only plans.
Conference abstract submissions.
IETF news including DHCPv6 updates (to advertise routers or not?).
Recent statements from sites not yet deploying dual-stack.
How to track status of dual-stack WNs?
Agenda will appear soon.
7. AOB and dates of next meetings.
There was no AOB.
Two-day meeting 14/15 Oct 2022. Dates of meetings later in year will be defined then
There are minutes attached to this event.
Show them.
