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Filesystem Shenanigans

I can't migrate/replicate because my two file systems are named differently

For replication, try the pve-zsync command.

apt install pve-zsync
pve-zsync sync --source 200 --dest 192.168.1.202:rpool/data --verbose --maxsnap 1 --name LuggageTN_Replication2 [--skip] # Sets the replication up
pve-zsync list																											 # See the configured Replications
pve-zsync destroy --source 200 --name LuggageTN_Replication																 # Destroy a replication job
nano /etc/cron.d/pve-zsync																								 # You can adjust the timings. Default is every 15 minutes.

PCIe Shenanigans

It keeps saying 'failed to setup container for group **: Failed to set group container: Invalid argument'

Assuming you're running ZFS (You should be):

nano /etc/kernel/cmdline
replace existing line with:
root=ZFS=rpool/ROOT/pve-1 boot=zfs quiet intel_iommu=on,relax_rmrr vfio_iommu_type1.allow_unsafe_interrupts=1 iommu=pt intremap=no_x2apic_optout

proxmox-boot-tool refresh
update-initramfs -u -k all

You want to blacklist a PCI Device WITHOUT blacklisting all drivers

This is probably for SATA Reasons.

lspci -nn -k
search for your target device(s) and look for a number like [1028:1f4b] and the driver(s) in use
echo "softdep megaraid_sas pre: vfio-pci" >> /etc/modprobe.d/vfio.conf
echo "options vfio-pci ids=1028:1f4b" >> /etc/modprobe.d/vfio.conf
echo "options vfio-pci ids=8086:0953" >> /etc/modprobe.d/vfio.conf
update-initramfs -u -k all