I want to build a proper server with room for 40+ HDDs to move my media server to and have RAID 1. I know a lot about PCs and software, but when it comes to server hardware I have no clue what I'm doing. How would I go about building a server that has access to 40+ RAID 1'd HDDs?
The other option to the server that was posted is to get a DAS Enclosure that you can then hook up to a server or anything that can use a SAS/SATA card. These are generally going to be cheap because it is just a SAS/SATA backplane/expander.
Edit: eBay is useless. Here's an example DAS https://www.aventissystems.com/HPE-MSA30-DAS-Storage-Basic-p/200051.htm