UNSOLVED
Adding Second PCIe enabled FlexBay backplane to a 5820
I got my hands on a second PCIe enabled back plain and replaced the bottom flex bay with it. Since the motherboard only has 2 U.2 ports I got a splitter and put it in slot 2. I verified that the bottom bay works by connecting it to the oneboard connectors but when I connect to the pcie to U.2 splitter (https://www.amazon.com/Expansion-Adapter-SFF-8643-Indicator-Breakout/dp/B0B7BHM954) it does not appear in the OS. I am running proxmox as the main operating system. I am quite confused about why this might be happening.
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Posted November 28th, 2025 10:40
Also in which slot did you put that adapter ? Because there's only a 2nd 16x slot , see below
(edited)
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Posted December 2nd, 2025 02:22
I plugged it into slot 2 and it was not being detected. I did not see them in the bios at all. I tried a separate 4x4 u.2 to pcie adapter in slot 6 to the same effect. I am really at a loss how to debug this.
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Posted December 2nd, 2025 08:19
Without a hardware RAID controller such as LSI MegaRAID, if you are going to use a PCIe x16 slot, why not using a Dell Ultra-Speed Quad or an Asus Hyper V2 adapter which can support up to 4 NVMe drives.
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Posted December 6th, 2025 15:58
I have enterprise SSD's with the U.2 NVMe connection. Does the connection off the flexbay have to go through a hardware RAID controller?
mazzinia_
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Posted November 28th, 2025 10:27
Hello,
have you looked in the bios, to see if they are detected and not disabled ?