Good day to everybody at the devel-list. And greetings from Finland! The library of Joensuu has started a project to compare different open source library systems, mainly Koha and Evergreen, with the goal of moving from our current closed source system to open source. We are planning to create a consortium of minimum of a ~20 libraries, but if open ILS are found to be superrior, probably the consortium can easily grow to ~250 libraries with ~5 million articles and ~150 000 transactions/hour. I have been hard pressed to find answers to the hardware requirements of Koha and Evergreen and have been instructed to ask here on devel-list by your library managers. My main interests are the hardware requirements of the said large consortium mainframe. How well does it cluster? What sort of hard disk and ram requirements are there? How many pc units with for example 2GHz cpu, 2Gb RAM do we need? Could every library host their own databases or should they be centralized? What are the average search speeds using simple SELECTs and then complex JOINs. What are the system bottlenecks? Can the OPAC be integrated with Drupal/Liferay so it can be compatible with our new web-services strategy? Are there any publications I could read about these topics? Happy coding! -- Olli-Antti Kivilahti Open Library 2013 Library of Joensuu