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Does anyone use a 4bay 1u shortdepth chassis (305mm or less?). QNAP have the perfect size, both 4bay and 8bay, but I'm keen to use unraid if I can find the right DIY chassis.

Hello, I currently have an 8 bay desktop NAS. I want to transition to a rack based solution, however I am insanely restricted on depth - my rack will only take a 305mm deep enclosure. The only ones I can find are 1u, and they will only take 2 disks. However, QNAP sell an expansion unit called TL-R400S, it takes 4 disks, and comes with a QXP PCIe card for connecting the enclosure using a SFF-8088 (or SFF-8644). Can I just use a different PCIe card and connect it to an app server running Unraid? I don't know much about HBA's at all, and I am not sure if the QNAP device will only play well with QNAP software (which I want to move away from). Thanks, Lux