WLCG DOMA BDT Meeting

Wednesday 18 Oct 2023, 16:30 → 17:30 Europe/Zurich

Brian Paul Bockelman (University of Wisconsin Madison (US)), Maria Arsuaga Rios (CERN), Petr Vokac (Czech Technical University in Prague (CZ))

Topic: WLCG DOMA BDT Meeting (twiki)

16:30 → 16:35 News

16:35 → 16:45 Tape REST access

Speaker: Mihai PATRASCOIU (CERN)

StoRM TAPE REST implementation

• should be already available according Stephan

CMS status

• ~ 3 sites ready to be switched to TAPE REST
• davs protocol in Rucio already configured for TAPE RSEs
  • Rucio automatically sends transfers requests from TAPE RSEs with "bringonline timeout"
  • this is sufficient for FTS to use TAPE REST for davs transfers
• now it is sufficient just to delete SRM protocol

ATLAS status

• details tracked in the Tape REST twiki timeline (FZK, CERN in production)
• stuck while trying to understand if it would make sense to reorganize storage namespace for tokens
  • no reorganization
• revive effort to move away from SRM

16:45 → 17:00 Transfers with tokens

Speakers: Petr Vokac (Czech Technical University in Prague (CZ)), Francesco Giacomini (INFN CNAF)

Rucio / FTS & tokens

• recent update at Dirac & Rucio Workshop - slides for Rucio & FTS
• to be evaluated during November DC24 Workshop

dCache access with just tokens including storage.* scopes

• latest dCache allows more simple configuration that gives access only to tokens with storage scopes
  • available in 9.2 and backported to 8.2.33
• ongoing tests before we ask dCache sites to configured tokens
  • DESY is testing this configuration
  • FNAL also for CMS
  • PRAGUELCG2 is going to test it for ATLAS
• preferred solution for WLCG experiments
  • sites will be most probably asked to move to the most recent dCache releases when they would like to enable tokens

17:00 → 17:10 Packet marking

Speakers: Marian Babik (CERN), Shawn Mc Kee (University of Michigan (US))

Scitags support announced:

• Rucio from 32.4.0 (interface to FTS to be defined)
• FTS from 3.12.11 and GFAL2 from 2.22.0
  • release next week / deployed on CERN pilot instance
  • other production instances with standard schedule (+ 2 week)
• Xrootd (this ticket now becomes relevant: https://github.com/xrootd/xrootd/issues/1984 HTTP-TPC support)
  • Brian contacted Cedric - XRootD development can move forward with SciTag support
  • currently XRootD supports just static configuration (can't be used on multi-VO instances and no activity details)

UCSD/Caltech testing flowd, interested in both fireflies and packet marking
.  - Looking into flowd integration with Kubernetes
.  - Packet marking readout already available via sFlow

Preparations for SC23 on-going, plans:
.   - Show 400Gbps packet marking (with xrootd, disk-to-disk and iperf3)
    - Use fireflies and show R&E dashboard based on data received (in collaboration with ESnet)
 
We will submit abstract to DC24 workshop to give an update on our plans.

Meetings on BBRv3, TC, jumbo frames testing (https://indico.cern.ch/event/1329666 https://indico.cern.ch/event/1337182/)

17:10 → 17:25 WebDAV Error Message Improvement Project & unified error message format

Discuss with experts improvements in the error messages produced by failed transfers.
https://twiki.cern.ch/twiki/bin/view/LCG/WebdavErrorImprovement

Speaker: Stephan Lammel (Fermi National Accelerator Lab. (US))

17:25 → 17:30 AOB

Next meeting only after DC24 Workshop (November 9-10)