System overview

General overview of the system architecture and functionalities.

System components

There are the following types of clients components in a BitRepository system:


Pillars are responsible for maintaining copies of the store material and providing bit preservation related operations on these

There are the following types of pillars seen from the data perspective:

  • A full copy pillar, which contains full copies of delivered files identified uniquely with a service level agreement
  • A checksum pillar (with specific checksum type), which contains derived copies of delivered files, in form of a checksum. The checksums are identified uniquely with a service level agreement in the same way as for full copies pillars.


Clients which can be used to perform operations on the BitRepository, e.g. PutFile, GetFile, etc.

See Operations descriptions for a full listing of operations.


Services actively perform tasks without user triggering, see Reference services for examples of services.


Provides the communication infrastructure for integrating the components. This consists of:


  • Components have no direct knowledge of each others location. Communication is rather performed indirectly by using the specified Queues and topics.
  • All communication is asynchronous.