The Chronopolis system has two sets of software which interact with each other in order to provide bit-level preservation. The first set, ChronCore, is a set of services which distribute data throughout the Chronopolis network. These services are named Intake, Ingest, and Replication. The second software employed by the Chronopolis network is the Audit Control Environment (ACE) which continually audits data in Chronopolis to ensure the integrity of both the checksums and files. ACE consists of both an Audit Manager (ACE-AM) which runs locally and an Integrity Management Service (ACE-IMS) which is a web service currently hosted by UMIACS.
In addition to the software used for distributing data through the network, there are additional services for tertiary tasks:
- Repair - automates the workflow for correcting file errors within the Chronopolis Network
- Restore - automates the workflow for returning data back to a Depositor
Data in Chronopolis is packaged using the BagIt specification.
An institution, person, or conglomerate which is a part of Chronopolis and has data to be stored for bit-level preservation
The second distribution service layer which acts as a registry of content and manages where data is distributed in Chronopolis. The process of registering the contents of a bag with the Ingest database, and creating ACE tokens for each file in the bag.
The first distribution service layer which brings external data into Chronopolis. The process of transferring a bag to a filesystem directory where an Ingest service can process it.
An organization which is part of the Chronopolis Network and stores data for Depositors
A filesystem which is used for holding data long term; is continually checked for bit rot
A service which takes actions to correct any data which has become corrupt at a Chronopolis Node
The final distribution service layer which transfers data from a staging area into a Preservation storage filesystem
The action of returning data to a Depositor
A filesystem which can be used for transient data; not guaranteed to have bit-level preservation