Release Notes for NorduGrid ARC 6.8.1

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October 8, 2020

This is an express release which targets purely the arc.conf changes related to the deprecated arc.conf values in ARC 6.8.0 .

In ARC 6.8.0 the ARC validator would prevent ARC from starting up if any of the deprecated blocks and options were present in arc.conf. From 6.8.1 ARC will start even with the deprecated options in place. Note however that they are still deprecated and should be removed. The options will have no effect to your running instance of ARC, thus of no value.

The deprecated arc.conf values in ARC 6.8.0 are:

For all the other changes included in 6.8.0, please refer to the release notes.

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 6.8.1 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 6.8.1 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.


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

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