Hi all, For a long time, I've been thinking about how Koha could scale better, and I'm wondering what other people are thinking about this topic. I think Mengu is probably the best expert on this topic that we have on Earth, so especially curious about his input. It's relatively easy to add more Apache web servers, more MySQL nodes, and more Elasticsearch nodes. but the same might not be said for other parts of Koha like the following: 1. Zebra a. In theory, you could load balance queries to a cluster of Zebra listeners b. But indexing updates to many Zebra databases could be tricky (I don't know if Zebra's database can support many readers). I suppose you could alter rebuild_zebra.pl to update multiple databases in a variety of different ways. I imagine Mengu could speak to this, as I recall him talking once about needing to do work to make Zebra scale? 2. I'm not familiar enough with the SIP server to say a. Off the top of my head, I think a TCP load balancer would be good enough here 3. Z3950 Responder? a. I'm not familiar with this daemon 4. What about cronjobs? Only 1 instance should execute the cronjobs. a. I suppose a person could disable cronjobs on all Koha nodes except for 1? It wouldn't be very robust in terms of availability but it would technically work most of the time. Any other thoughts? David Cook Systems Librarian Prosentient Systems 72/330 Wattle St Ultimo, NSW 2007 Australia Office: 02 9212 0899 Online: 02 8005 0595