RAID 5 Data Recovery (Missing Partition)

I really need help.

I am running an XCP-NG server, with an LSI MegaRAID 9260-8i card installed. I have a RAID 5 virtual disk with one partition on said disk that takes up all the space. That partition is now mysteriously gone. Here is what I had done before I noticed this:

Ran the following command:

sudo yum install -y tar bzip2 make automake gcc gcc-c++ pciutils
elfutils-libelf-devel libglvnd-devel

I actually started it, CTRL+C’d out, and then actually ran it.

Next, I wanted to configure PCI passthrough for my VMs, so I exited into the BIOS to enable IOMMU. After enabling it, I came back to my server only to see that the partition on my virtual disk (on the raid controller) was completely gone. No sign of it on lsblk.

For whatever reason, my partition on the RAID card is now gone. No sign of it. It contained days worth of configuration work, as this is a brand new server. I really don’t want to redo all of that. Please someone come to my rescue!

Edit: looks like the folder where I would mount the array has disappeared, along with my /etc/fstab entry.

I installed the RAID management software, it’s now seeing my RAID5 as a RAID0.

Output of lspci -v

My OS drive does have some mysterious unrecognized 18Gb partition that I can’t mount. I don’t think XCP-NG made it.