Greetings, 200 administrative users?! Simultaneously? If so, I would go with more than 4GB. As has always been said, more memory is never bad. However, I do think the 2 CPU, 50GB Drive Space VM would otherwise do. Your problem will not be hosting the data. Your problem will be accessing the data. I typically assume 100MB per simultaneous user + 2GB for OS + 10KB* items (not biblios, items) * 4. It has generally been my experience there is a 100MB footprint for a Koha access with default Apache, no special tweaks. And while the memory leaks do recover over time, they don't recover quickly. But who has the time to figure out how to configure Apache even more optimally?! And while you probably can run your OS for less than 2GB, OS's do strange things like kill processes when it starts getting tight on memory and you don't have swap configured. The 10KB I believe is the maximum size of a MARC record. Ours typically run more like 4-5K, but we have some that are large. The 4 factor accounts for a full reindex, given that Zebra + MySQL + Both trying to cache. Yes, it's overkill. But you want some room, not squeeze and barely hobble along. To summarize with your variable value plugged in: Users: 100MB * 200 = 2000MB ~= 2GB OS: 2GB Data: 10KB * 50000 * 4 ~= 2GB I would recommend more like 6GB, and then if 200 checkouts/searches/whatever's happened simultaneously, you will have no issues. You will, however, find that VM Host providers tend to like powers of 2, so you may need to jump to 8, which is way more than you will need. Now, if you aren't going to have 200 people accessing your Koha all at the same second (i.e. okay, everyone, click search in 3, 2, 1... NOW *the sound of 200 simultaneous clicks*), but rather just have than many administrative users, and only 20 are on duty at any given time, then plug in 20, not 200. And then you'll see that you probably will cope okay with 4GB. You'll need to also consider patron OPAC searches into this equation too. Just my suggestions. GPML, Mark Tompsett -----Original Message----- From: Victor Barroso Oliveira Sent: Tuesday, March 26, 2019 10:45 AM To: koha@lists.katipo.co.nz Subject: [Koha] Hardware Koha 18.11.03 what ideal configuration of a machine to use koha with 50,000 records and 200 administrative users accessing the adm interface for loans and returns? CPU Memory HD.... _______________________________________________ Koha mailing list http://koha-community.org Koha@lists.katipo.co.nz https://lists.katipo.co.nz/mailman/listinfo/koha