Release Notes for NorduGrid ARC 6.8

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October 8, 2020

We are pleased to announce the release of ARC 6.8.0.

This release comes with two important changes that affect the update, namely changes in the accounting system, and a dependency on xrootd5. Both will need manual steps when updating to ARC 6.8.0, the latter only if your CE has the nordugrid-plugins-xrootd package installed.

Accounting changes

The largest change in this release is the removal of the pre 6.4.0 accounting system. Since the accounting subsystem changes in 6.4.0 where we went from files to database, the old system has lived alongside the new. From 6.8.0 the legacy code is all removed. For more details of the consequences, and especially changes in arc.conf, please see the complete description of changes.

If you want to read more about the accounting changes, please consult the overview document. And, finally, you can consult description of the new system.

Please be aware that you will need to make changes in your arc.conf for ARC to start with 6.8.0.

Options and blocks that are no longer supported in arc.conf

Important note on xrootd version for sites using the nordugrid-arc-plugins-xrootd package

For sites who install the nordugrid-arc-plugins-xrootd package note that ARC 6.8.0 is built with xrootd 5. On the date of the release xrootd 5 has not yet reached EPEL-stable, which means that to install(update) ARC 6.8.0 on RHEL-systems, you must enable the epel-testing repo: yum install(update) "nordugrid-arc*" --enablerepo=epel-testing or alternatively install xrootd 5 before updating ARC.

Highlights in this release

The following Bugzilla tickets have been adressed or solved


The ARC 6 documentation can be found 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

As of June 2020 no more security updates are provided to ARC 5. Also since the release of ARC 6 in June 2019, no more development on the ARC 5 code base has been provided.

Production Sites already running ARC 5 will still get operational site support in form of deployment and configuration troubleshooting help via GGUS until end June 2021. However, we may recommend upgrading to ARC 6 depending on the issues the site is facing.

ARC5 is available in EPEL7 and will stay there. EPEL8 will only contain ARC 6. To install ARC 6 from EPEL7 the package-names are of type: nordugrid-arc6-*

Getting in touch

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

Known issues

Previous releases

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

NorduGrid homepage