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As of 23 March, the Climate Data Store (CDS) and Atmosphere Data Store (ADS) are the first two user-facing services operationally supported by our new Data Centre in Bologna. Following that successful migration, we would like to update you on the next steps in the transition to the Bologna Data Centre.

We are now approaching a phase when some degradation of the services provided by the Data Handling System (DHS), the Meteorological Archival and Retrieval System (MARS) and the ECMWF's File Storage system (ECFS), is to be expected and may impact some of our Climate Data Store (CDS) and Atmosphere Data Store (ADS) data users. 

The ECMWF Data Handling System (DHS) Move, causing 28 days of reduced MARS and ECFS service, is expected to start in mid-June 2022. Two short periods of disruption (dry-runs) with reduced MARS and ECFS service for 12-48 hours are scheduled for 26-28 April 2022.

It is important to note that some CDS datasets served from MARS tapes will not be accessible during those two forthcoming dry-runs. Users may still submit CDS and ADS data requests which will remain in the queue until data access is resumed. A banner will appear at the top of affected datasets on the CDS to remind users of disruptions closer to the time of the dry-runs.

For more detailed information  on the datasets affected, visit this ECMWF forum post:

We strongly encourage you to “Watch” this Forum post to receive email notifications of any future updates.

We thank you for your patience during this significant migration to our new data centre which will enable exciting scientific developments and overall better service to all ECMWF users.