Hi We are currently running Koha 18.11 on Debian GNU/Linux 9 (virtual machine with 2 processors, 4 GB RAM) and 50'000 bibliographic records in a MariaDB database, using Zebra, and of course Plack and Memcached. There are only about 160 users. We would like to add 6 million bibliographic records (metadata of articles) that before were only indexed in the Solr index of a proprietary discovery system, but not in Koha itself. Since we are lacking experience in such large masses of data we would like to investigate about the consequences: * Will the overall performance and especially the retrieval experience suffer a lot? (note there are only 160 users) We're afraid it will... * If yes, is there a way to improve the retrieval experience? For example changing from a virtual machine to a dedicated or physical host? Adding more resp. faster processors, more RAM? Using SSD disks instead of SAS? Changing from Zebra to Elasticsearch? Or will we need to implement another discovery system, like Vufind (which is using Solr Energy)? Any tips or hints are very much appreciated! Best wishes: Michael -- Geschäftsführer · Diplombibliothekar BBS, Informatiker eidg. Fachausweis Admin Kuhn GmbH · Pappelstrasse 20 · 4123 Allschwil · Schweiz T 0041 (0)61 261 55 61 · E mik@adminkuhn.ch · W www.adminkuhn.ch