Business Continuity Management – Systems Unavailability test date


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, we will again be offering customers the possibility to participate in our Business Continuity Management (BCM) test planned for

Saturday, 7 October 2023

On that day, we shall simulate the unavailability of one of Clearstream’s production data centres. 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. Customers will have the opportunity to participate in the test between 13:00 and 15:00 (CEST) to validate their connectivity and processing. Customers will also be able to access the T2/T2S platforms between 13:00 and 15:00 (CEST).

All data input during the test will be processed. Normal processing will continue with the RTP period starting at 21:05 (CEST) Sunday, 8 October 2023.

In view of the circumstances of the test, all timings quoted here can only be approximate.

Timeline of events

Normal processing

Friday 06.10.23


  • End of real time settlement value date 06.10.23.
  • Any instruction received as from this point will be processed in the RTP period running on Saturday.

Both data centres

Start of test

Saturday 07.10.23


  • 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.

Remaining data centre


13:00 – 15:00

  • Applications will run in the remaining location.
  • Open window to test connectivity with the remaining location.
  • Open window to receive customers’ instructions to be processed in the remaining location within the RTP period (value date 09.10.23).
  • Customers can extract the reports.

Remaining data centre

Saturday 07.10.23


  • End of Test.
  • Data centres switch back to normal configuration with no further access for the rest of the day.

Both data centres

End of test

Sunday 08.10.23


  • Start of RTP period value 09.10.23.

Both data centres

Customers 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.

Customers can also consider using their own backup site.

More information is available in the Questions & Answers document which is provided below for Premium Users only.