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When would I regenerate derivatives and/or datastreams for my objects?

You should regenerate your object's derivatives and/or datastreams in the event of an interrupted batch or single object ingest. Usually during an interrupted ingest, your object is ingested into the repository, but due to an error, the complete ingest process of creating derivatives and other datastreams is interrupted. Instead of deleting your object, it is quicker to regenerate the derivatives and datastreams in the repository.

How can I tell if I need to regenerate the derivatives and/or datastreams for my objects?

There are a number of ways you can tell if your object's derivatives and/or datastreams need to be regenerated. The most obvious sign is that your content will not display on your object page. For example, book and newspaper images will not display in the Internet Archive Book Viewer. You can also tell when your object displays a blank silver folder instead of a thumbnail.

Warning

Collection Objects have a silver folder by default until a thumbnail image is manually added to the objects TN datastream. You do not need to regenerate the datastream of Collection Objects that are missing the TN Datastream.

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What are Derivatives?

Derivatives are copies of files in different formats that serve both archival and display purposes. In Islandora they are usually created when the asset is ingested into the repository. To learn more about deriviatives, see the "What are derivatives? Why do I care?" blog post on islandora.ca

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Datastreams

To learn more about datastreams, see the Datastream Guide


How to Regenerate Derivatives

  • Log into manage.ctdigitalarchive.org

  • Find the object that lacks derivatives. Open the object and click the manage tab.

  • Select the "Properties" button.

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  • You will need to put a lock on the object before making changes. Click here for more information on locks.

  • Select the "Regenerate all derivatives" button.

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  • Next, click the "Regenerate" button.

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  • The next page will show you the progress of the regeneration process.

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  • Once the process is complete, you will see a "Derivatives successfully created" message.