The kernel does not see any SATA ports that are behind SATA port multipliers such as those used on ASM1166 and ASM1064 based SATA host adapters.
It appears related to this Linux kernel commit:
https://github.com/torvalds/linux/commit/9815e39617541ef52d0dfac4be274ad378c6dc09
The commit attempts to correct over-enumeration of SATA ports, but it does not account for port multipliers that are common in a large number of SATA cards.
A reverse patch has been merged to the kernel tree, but it looks like Unraid must be using an affected kernel build. See:
This is a critical failure for many people in this release.
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