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Storage accounting in APEL is based on the StAR (Storage Accounting Record) developed by EMI in conjuction with the OGF Usage Record Work Group (UR-WG). The format is documented here.

EMI delivered StAR solutions for dcache and DPM in EMI-3. In both cases the storage service queries its database at a site and extracts data to populate StAR usage records. The site then uses SSM as a transport method to send the StAR records across the EGI Messaging Service to APEL's central accounting repository. 

Deployment Instructions

Get the accounting script

Follow the link for your product.


DPM - you need to run 1.8.7 or higher. For earlier releases it can be found here http://svnweb.cern.ch/world/wsvn/lcgdm/lcg-dm/trunk/scripts/StAR-accounting/star-accounting.py

On the command line which runs the script, add --site="your-GOCDB-sitename"

Get the SSM software

The APEL SSM software can be installed from the yum repo or by downloading an rpm or tarball. See here for more information: SSM

Get authorised

While storage accounting publishing is still in test mode please send the host certificate DN to apel-admins@stfc.ac.uk and ask them to authorise you for storage publishing.

Configure SSM

To configure apel-ssm for sending acounting records we have to edit the file /etc/apel/sender.cfg, and modify some parameters:

  • In the [broker] section, you need:

network: PROD and not: network: TEST-NWOB as for initial testing. Also set:

use_ssl: false

  • In the [certificates] section, you need to set the host certificate to be used by the sender:

certificate: /path/to/your/host/certificate
key: /path/to/your/key

  • In the [messaging] section, you need:

destination: /queue/global.accounting.test.storage.central - as described here: ​https://wiki.egi.eu/wiki/APEL/SSM2Configuration.

dcache and dpm should send one StAR record per VO. Please set up a cron to run once per day.

Configure GOCDB

When storage accounting moves to the production message broker network then you will need to add a servicetype to GOCDB for the host which runs SSM. The servicetype has not yet been defined but it will require the host certificate DN.

Running the Accounting Software

Create a cron job to run your accounting script followed by the SSM sender. We recommend that you send storage accounting data once per day. There will be a delay of up to 24 hours before you see the data you have sent in the Accounting Portal.

Storage Data at the EGI Accounting Portal

Accounting Portal Prototype view 

Note that the default view of 'Minimum Resource TeraBytes Consumed' will probably show zero when you start to publish. Chose Average or Maximum instead

A list of sites publishing storage accounting, with last publish dates.