What is the gadget attached to the front of the shelf with the two cables? 
Looks like a fiber to ethernet converter.
This is xPON ONU (like a media converter)
Add: seems like Ubiquiti UFiber Nano G (UF-Nano)
That is the ONT, which in the routers supplied by the ISPs is all integrated into one.
Budget UPS dual Node :
-Lenovo x260 dual battery laptop
-Ubuntu 20.04 LTS
-1 Node on a 4TB USB 2.5" Toshiba drive
-1 Node on a 4TB USB 2.5" Seagate drive
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16х3TB SAS drives.
electricity did not measure, it is cheap in Russia
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The plant is powering the node 
No, it’s not too clear in the picture but the power to the plant is for some Christmas tree lights.
NVMe now!
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Off: / directly connected to USB? What is the speed / response time compared to the SD card?
I’d call the speed disappointing :
#time dd if=/dev/sda of=/dev/null bs=1G count=100
100+0 records in
100+0 records out
107374182400 bytes (107 GB, 100 GiB) copied, 318.691 s, 337 MB/s
real 5m18.845s
user 0m0.001s
sys 4m37.314s
on the Pi4
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Looks roughly what USB3.1gen1 is capable of.
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wow, do you use them like RAID and big nodes?
WOW, that’s a nice setup.
I like the monitor sticker. “Intel Inside Pentium 4 HT!!”
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I use few zfs raidz1 4+1 with 4mb recordsize and compression zle
isn’t faster to use all HDDs separete? thay will work faster. and give aditional space
This cases full of cheaper used 3tb drives, but nodes near 10tib
And zfs send receive much faster with raid than one drive. I move nodes very frequently.
ZFS speed i think faster than 1 drive but not faster than 5 drives separatly, redundency kill some speed.
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