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 essential data, necessary to continue operational and time-critical activities, 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. Some of the dry-runs will last for 1-2 days. A final longer dry-run, lasting 5-7 days, is expected to happen 4 weeks before the move and will help to establish the exact date of day D.
The table below gives an indication of disruptions to the MARS and ECFS service foreseen as part of the DHS-Move.
Event | Date | Duration | Impact |
---|---|---|---|
Dry-run 1 | September 2021, TBC | 12 hours | degraded access to non-essential data |
Dry-run 2 | September 2021, TBC | 24 hours | degraded access to non-essential data |
... | ... | ||
Final dry-run | October 2021, TBC | 5-7 days | degraded access to non-essential data |
DHS-Move | November 2021, TBC | 28 days | degraded access to non-essential data, with data becoming gradually available again during the move |
User group | Impact |
---|---|
Member State User (fully registered computer user) | mars-client/WebAPI/ECFS - limited to essential data |
Web User (registered by MS) | WebAPI - limited to essential 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.) |
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. |
No impact expectedThe following essential services/data are not expected to be impacted by the dry-runs and the DHS-Move:
|
Access to non-essential services/data will be affected as described below.
Non-essential services and access to data degraded during dry-runs and the DHS-Move:
The following services/data will not be available during dry-runs and the DHS-Move:
During dry-runs and the DHS move access to data archived in ECFS which has not been identified as essential will not be available. However, archiving into ECFS should not be affected by the DHS migration.