We have an installation with Conquest 1.4.12 alpha here. It works (worked...) flawlessly with 1.4 * 10^6 images, 750 Gb of size. However, we had to rebuild the database to switch to a larger disk, which became tedious. The "regen" or "re-initialize" feature of Version 1.4.12 alpha slows down to approx 2 images in 3 seconds after approx 800 000 images and continues to slow down. If you don't have time to wait for weeks for the rebuilt of the db and stop the regen, you are left with a working database, but an incomplete and painfully slow one.
So actually the only fesible approach appears to be to copy smaller chunks of the files (in the range of 50-100 000 images) to other pcs, import them there into other conquest db, and send them from there via dicom to the main db. This is a task for days . I don't know if there actually is available a streamlined integration of conquest with mysql and a pref file/ini-file appropriate for larger db, but two years ago (the time when we started our 'provisorial' conquest-PACS) there wasn't any.
I would be interested in any suggestions.
Kind regards