A presentation at Samvera Virtual Connect 2019 described thus and 6,761,224,773 words. 2,823,957 images. 200+ content sources. And a very long tail of unique metadata fields. This will be a "by the numbers" tour of the digital collections at the University of Michigan Library that highlights some of the challenges of designing and building a new repository and access system for our digital collections that can handle scale, variety, growth, and a rich feature set.
A presentation given at Connect 2017 described thus, Michigan's Research Data Repository has been in production since Feb 2016. Presentation on experiences and challenges of transitioning from Sufia to Hyrax, and adding new features and running the service over the past year.