Release Notes for NorduGrid ARC 6.5

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February 14, 2020

We are happy to announce the ARC 6.5.0 release. This release comes with quite a large set of enhancements and improvements.

Bug 3841 (jobs piling up in FINISHING state) which one known site suffers with, is proving resilient. We believe that a busy file system hosting the job's session directory had strong negative impact on the data staging. This needs more investigation and future development to optimize the load on session directories.

However bug 3890 related to xrootd transfers, which had to be reverted in release 6.4.1, is now solved.

Highlights in this release

Of enhancements and new features we would like to highlight:


Client area enhancements:

ARCHERY management:

Technology preview:
This release also includes the technology preview of a new functionality: The "Community-defined RTEs" ecosystem that enables automated software environment provisioning on ARC CEs by community software managers. The ecosystem consists of two layers: An ARCHERY-based software (RTE) registry and a new set of ARC control tool modules. More details can be found in documentation.

The following Bugzilla tickets are resolved


The ARC 6 documentation has been rewritten in a modern format and is placed at this location.

If you miss something or have questions, please contact us!

Installing ARC 6

We recommend to install ARC release using the Nordugrid repository.

Note that if you instead install from EPEL for RHEL7 compatible systems, the ARC 6 packages can be found as nordugrid-arc6-* and not nordugrid-arc-*. This was needed in order to supply both ARC 5 already available for RHEL7 and the new ARC 6.

We provide binary builds for all supported versions of:

In addition we build nightly packages for older platforms.

Future Support of ARC 5-series

Note that now that ARC 6 is released, we will only provide security updates of ARC 5.

In particular:

  1. No new feature development is planned or going on for ARC5 and no bug-fixing development will happen on ARC5 code base in the future except for security issues.
  2. Security fixes for ARC5 will be provided till end of June 2020.
  3. Production Sites already running ARC 5 will be able to get deployment and configuration troubleshooting help via GGUS till end June 2021. This we call "operational site support".
  4. ARC5 is available in EPEL7 and will stay there. EPEL8 will only contain ARC 6.

Getting in Touch

If you need help with the configuration file or have any other questions related to ARC 6, please contact us via

Previous releases

Details of previous releases can be found at the ARC Releases page

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