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Table of Contents |
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NEWS! Service disruption during dry-run system session 28 June - 5 July Dates for the 7 day dry-run and the DHS-Move announced, see Main service disruptions. The DHS-Move will not start before late July. Dates of the expected service disruptions will be issued by mid-June. The dates of the next steps towards a main DHS in Bologna will be announced by the end of May
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Transition plan
The Data Handling System (DHS), providing the MARS and ECFS services, needs to be moved to Bologna before the new Atos HPCF will produce an increased archive load. A detailed migration timeline is shown in the transition plan below where all events are relative to day D, the day when the MARS and ECFS service will stop accessing the Main-DHS-Reading. Instead the MARS and ECFS service will be provided by a temporary DHS which has been pre-filled with data necessary to continue operational and time-critical activities at ECMWF, with the aim to minimise the impact of the DHS move. After 6 days we will start filling the new Main-DHS-Blank with the data from the Temporary-DHS-prod and from the Main-DHS-Reading. At the end of the DHS-Move, expected to take 28 days, a new main DHS will become operational in Bologna. In preparation of the DHS move we will conduct a number of dry-runs during which the access to the main DHS in Reading will be blocked. The purpose of the dry runs is to verify that the Temporary-DHS does contain all essential data necessary to continue all critical activities during the move. A longer dry-run, lasting 5-7 days, expected to happen at least 4 weeks before the move, will help to establish the exact date of day D.
Main service disruptions
The table below gives an indication of disruptions to the MARS and ECFS service foreseen as part of the DHS-Move. Dates are subject to change depending on experience with preceding dry-runs.
Event | Start Date/Time | Duration | Impact |
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Dry-run 1 | 5 April 2022, 8 UTC | 10 hours | access limited to available data, see DHS move dry-run for more details |
Dry-run 2 | 26 April 2022, 10 UTC | 48 hours | access limited to available data, see DHS move dry-run for more details |
Reduced service dry-run | 28 June | 7 days | access limited to available data, see DHS move dry-run for more details |
DHS-Move | 8 September | 28 days | access limited to available data, all archive content becoming gradually available again during the move |
Summary of impact by user group
This table highlights how specific user groups will be affected by the DHS-Move. See further below for more details on the availability of specific data.
User group | Impact |
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Member State User (fully registered computer user) | mars-client/WebAPI/ECFS - Access limited to available data |
Web User (registered by MS) | WebAPI - Access limited to available data |
Commercial and research user (maxch*, comarc*, resarc*, nm*) | WebAPI - No access to historical operational data and IFS research experiments |
Public users | WebAPI - No access to public datasets (TIGGE, S2S, etc.) |
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Commercial users (comarc_*) with a valid licence during the outage will have the equivalent length of the outage added to their existing contract length. Users may also opt to terminate their licence with 4 weeks notice. |
Impact to MARS service
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The following list of available data, not expected to be impacted during dry-runs and the DHS-Move, will be updated in light of further migration progress:
The following services are not expected to be impacted by dry-runs and the DHS-Move:
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Any data not listed as available during dry-runs and the DHS-Move will not be accessible, in particular:
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Impact to ECFS service
During dry-runs and the DHS-Move ECFS will be impacted as follows:
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The following list of available data, not expected to be impacted during dry-runs and the DHS-Move, will be updated in light of further migration progress:
The following services are not expected to be impacted by dry-runs and the DHS-Move:
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The following services/data will not be available during dry-runs and the DHS-Move:
The commands |
Recommended user action
- Users of MARS and ECFS are urged to check if and how their work might be affected by the DHS-Move and plan accordingly.
- Major changes to production processes etc. are best avoided during this period. For some activities the best course of action might be to avoid the migration period entirely...
- ECMWF computer users missing access to data for any critical activity during the DHS-Move should contact us at their earliest convenience with their requirements via the ECMWF Support Portal.