10-14 October 2016
San Francisco Marriott Marquis
America/Los_Angeles timezone

Deployment of IPv6 only CPU resources at WLCG sites

11 Oct 2016, 12:00
Sierra B (San Francisco Mariott Marquis)

Sierra B

San Francisco Mariott Marquis

Oral Track 6: Infrastructures Track 6: Infrastructures


Alastair Dewhurst (STFC - Rutherford Appleton Lab. (GB))


The fraction of internet traffic carried over IPv6 continues to grow rapidly. IPv6 support from network hardware vendors and carriers is pervasive and becoming mature. A network infrastructure upgrade often offers sites an excellent window of opportunity to configure and enable IPv6.

There is a significant overhead when setting up and maintaining dual stack machines, so where possible sites would like to upgrade their services directly to IPv6 only. In doing so, they are also expediting the transition process towards its desired completion. While the LHC experiments accept there is a need to move to IPv6, it is currently not directly affecting their work. Sites are unwilling to upgrade if they will be unable to run LHC experiment workflows. This has resulted in a very slow uptake of IPv6 from WLCG sites.

For several years the HEPiX IPv6 Working Group has been testing a range of WLCG services to ensure they are IPv6 compliant. Several sites are now running many of their services as dual stack. The working group, driven by the requirements of the LHC VOs to be able to use IPv6-only opportunistic resources, continues to encourage wider deployment of dual-stack services to make the use of such IPv6-only clients viable.

This paper will present the HEPiX plan and progress so far to allow sites to deploy IPv6 only CPU resources. This will include making experiment central services dual stack as well as a number of storage services. The monitoring, accounting and information services that are used by jobs also needs to be upgraded. Finally the VO testing that has taken place on hosts connected via IPv6 only will be reported.

Primary Keyword (Mandatory) Network systems and solutions

Primary authors

Alastair Dewhurst (STFC - Rutherford Appleton Lab. (GB)) Andrea Sciaba (CERN) Costin Grigoras (CERN) Dave Kelsey (STFC - Rutherford Appleton Lab. (GB)) Raja Nandakumar (STFC - Rutherford Appleton Lab. (GB))


Bruno Heinrich Hoeft Daniel Peter Traynor (University of London (GB)) Duncan Rand (Imperial College Sci., Tech. & Med. (GB)) Edoardo Martelli (CERN) Mr Fernando Lopez Munoz (Port d'Informació Científica (ES)) Francesco Prelz (Università degli Studi e INFN Milano (IT)) Jiri Chudoba (Acad. of Sciences of the Czech Rep. (CZ)) Dr Kars Ohrenberg (DESY) Mr Kashif Hafeez (STFC - Rutherford Appleton Lab. (GB)) Marian Babik (CERN) Ramiro Voicu (California Institute of Technology (US)) Simon Fayer (Imperial College Sci., Tech. & Med. (GB)) Mr Terry Froy (Queen Mary University of London) Thomas Finnern (DESY) Tiju Idiculla (STFC - Rutherford Appleton Laboratory) Ulf Bobson Severin Tigerstedt (Helsinki Institute of Physics (FI))

Presentation Materials