Business Continuity Management – Systems Unavailability test date
Reference
Clearstream's philosophy is to constantly improve products and services and we will continue doing so during our annual disaster test this year. This also applies to the Business Continuity Management programme. As part of this programme, clients of Clearstream Banking S.A. and Clearstream Fund Centre S.A. will again be offered the possibility to participate in our Business Continuity Management (BCM) test planned for
Saturday 11 October 2025
On that day, the unavailability of one of Clearstream's production data centres will be simulated and including the simulation of the loss of one availability zone of the cloud providers at the same time. During the course of the test, Clearstream systems will be run in contingency mode, which will apply also to the real-time processing (RTP) period. Clients will have the opportunity to participate in the test between 13:00 and 15:00 (CEST) to validate their connectivity and processing.
All data input during the test will be processed. Normal processing will resume with the RTP period starting at 21:05 (CEST) Sunday 12 October 2025.
In view of the circumstances of the test, all timings quoted here can only be approximate.
Timeline of events
Day | Time CEST | Event | Processing centre |
Normal processing | |||
Friday | 20:00 | End of real time settlement value date 10.10.2025 Any instruction received as from this point will be processed in the real time settlement period running on Saturday. | Both data centres and Cloud provider locations |
Start of test | |||
Saturday | 07:00 | Shut down and isolate completely the designated “Disaster” data centre, that is, only one data centre (“Remaining” data centre) is active during the open BCM test window. Make one availability zone unavailable for applications hosted by our cloud providers. | Remaining data centre and remaining availability zones |
Saturday 11.10.2025 | 13:00 – 15:00 | On-premises applications will run in the remaining location. Cloud-based applications will run in the remaining availability zones. Open window to test connectivity with the remaining locations. Open window to receive clients’ instructions to be processed in the remaining locations within the real time settlement period (value date 13.10.2025). Customers can extract the reports. | Remaining data centre and remaining availability zones |
Saturday 11.10.2025 | 15:00 | End of Test. Data centres switch back to normal configuration with no further access for the rest of the day. All availability zones back to normal configuration. | Both data centres and Cloud provider locations |
End of test | |||
Sunday | 21:05 | Start of real time settlement period value 13.10.2025 | Both data centres and Cloud provider locations |
Clients who would like to participate in the test are kindly asked to provide a contact person that can be reached if necessary. Please indicate the name, telephone, fax and email details of this person.
Clients can also consider using this opportunity to verify their own backup site or other contingency measures.
More information is available in the Questions and Answers document which is provided with this invitation.
