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ARC 6.8.0 and 6.8.1

The Advanced Resource Connector (ARC) middleware is an Open Source software solution to enable distributed computing infrastructures with the emphasis on processing large volumes of data. ARC provides an abstraction layer over computational resources, complete with input and output data movement functionalities. The security model of ARC is identical to that of Grid solutions, relying on delegation of user credentials and the concept of Virtual Organisations. ARC also provides client tools, as well as API in C++, Python and Java.

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,

If you want to read more about the accounting changes, please consult this file: And finally for the 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:

* In the [arex/jura] block: 
    * urdelivery_keepfailed (in [arex/jura] block)
* In the [arex/jura/sgas:targetname] block: 
    * legacy_fallback 
* In the [arex/jura/apel:targetname] block: 
      * use_ssl
      * benchmark_type
      * benchmark_value
      * benchmark_description
      * legacy_fallback
* [arex/jura/archiving] block  (the whole block is deprecated)
      * archivedir
       * logfile
       * archivettl

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.

For more details on bugs and highlights, please consult the release notes:

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.


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 runninginstance of ARC, thus of no value.

CVMFS 2.7.4

The CernVM File System provides a scalable, reliable and low-maintenance software distribution service. It was developed to assist High Energy Physics (HEP) collaborations to deploy software on the worldwide-distributed computing infrastructure used to run data processing applications. CernVM-FS is implemented as a POSIX read-only file system in user space (a FUSE module). Files and directories are hosted on standard web servers and mounted in the universal namespace /cvmfs.

Release notes

CernVM-FS 2.7.4 is a patch release. It contains bugfixes and improvements for Ubuntu clients and servers. At the same time, we release a new cvmfs-config-default package: please see detailed release notes in the technical documentation.

dCache 5.2.31

dCache provides a system for storing and retrieving huge amounts of data, distributed among a large number of heterogeneous server nodes, under a single virtual filesystem tree with a variety of standard access methods.

Detailed release notes on the official product site:

DMLite/DPM 1.14.0

The Disk Pool Manager (DPM) is a lightweight storage solution for grid sites. It offers a simple way to create a disk-based grid storage element and supports relevant protocols (SRM, gridFTP, RFIO) for file management and access. It focus on manageability (ease of installation, configuration, low effort of maintenance), while providing all required functionality for a grid storage solution (support for multiple disk server nodes, different space types, multiple file replicas in disk pools)

N.B. the gridftp and http frontends are now build together with the dpm core, so they have new package names

  • lcgdm-dav -> dmlite-apache-httpd
  • dpm-dsi -> dmlite-dpm-dsi

as well as the xrootd frontend starting from v 1.12: dpm-xrootd -> dmlite-dpm-xrootd

frontier-squid 4.13.1

The frontier-squid software package is a patched version of the standard squid http proxy cache software, pre-configured for use by the Frontier distributed database caching system. This installation is recommended for use by Frontier in the LHC CMS & ATLAS projects, and also works well with the CernVM FileSystem. Many people also use it for other applications as well

Release notes:

STORM 1.11.18

The StoRM Product Team is pleased to announce the release of StoRM 1.11.19 that includes the following updated components:

This release mainly:

  • fixes a bug introduced with StoRM v1.11.18 about the final update of the status on database of a srmPtG or srmBoL requests;
  • introduces new metrics in storm-backend-metrics.log;
  • fixes a storm-webdav bug about the returned body content in case of HEAD requests.

Please, follow the upgrade instructions.

Read the release notes for more details.

VOMS 10-20 release

This new release for several VOMS components fixing outstanding bugs and providing new features. With this release all VOMS components are now ported to CENTOS 7.

The updated components are:

Please have a look at the release notes for more details.

xrootd 4.12.5 and 5.0.2

XRootD software framework is a fully generic suite for fast, low latency and scalable data access, which can serve natively any kind of data, organized as a hierarchical filesystem-like namespace, based on the concept of directory. As a general rule, particular emphasis has been put in the quality of the core software parts.

Detailled release notes: