Expanding Raid onto Expansion Boxes used with TVS-1282T3

I have a QNAP TVS1282T3, and am filled up with no data space with in all my 8TB Reds that are in Raid 6 Configuration. I was told on the phone by a QNAP Customer Service guy back in December when I was considering the TX-800P, that I would have to make a separate pool in that 8 bay enclosure, and would have to set up Raid 6 in that pool of 8 drives in the expansion unit, and thus would lose 2 more drives worth of data, as they are parity drives. In your article here for the new QNAP TL-D800C, you say “it is JBOD only and requires the NAS, Windows PC or Mac System to create a RAID Space on the device or extend an existing RAID onto it”. That last half of your quote after the word “or” is what I’m interested in, and goes against what the QNAP guy told me, I’m hoping. So, could I add this expansion box, and use the two parity drives in the 1282T3 that I would hook this up to, and I would get the use of all 8 drives in the expansion box, as one pool together between the two boxes, so I don’t have to have two separate pools of Raid 6, one in each box? Please explain what you know about “extend an existing Raid onto it”.
And secondly, since I want to daisy-chain multiple expansion boxes together with my 1282T3, as I could have with the discontinued QNAP TX-800P, I know this TL-D800C doesn’t allow you to do this (due to only one USBC connection), and I would need to wait for the TR-108C2T. Would I be able to keep expanding my Raid-6 setup with multiple expansion boxes as one big pool and only losing the data storage of the two parity drives, or would I need to make a separate pool of Raid-6 setup drives with each expansion box I add, plus, the original Raid-6 pool in my TVS1282T3?

Sorry for lack of clarity, I have update the article. The TL-D800C can only be used as an individual storage pool or volume on the NAS. Its storage pool/volume cannot be combined into the connected NAS. NAS applications cannot be installed on the TL-D800C. Same applied to other USB, TB expansions. This is mainly due to insecurities. Someone can unplug the cable and RAID is lost. Also expansion unit power supply can die and you also loose RAID. And finally simply USB is not fast enough to deliver maximum bandwidth this additional RAID needs. TL series do work at respectable 10Gbit speed. So it is still a good expansion option. But serious rackmount expansions feature fast SAS connections allowing more secure and faster expansion setups.

Daisy chaining is not possible. Every expansion box need to be directly connected to a NAS itself. If there is no USB ports available you can add PCIe card with aditional USB ports. If there are ports but not USB-C type, then you can use different cable or adapter. The speed will not change based on the connector type.

Qnap  TL-D800C supplied USB-A to USB-C USB 3.2 Gen 2 cable which you can connect to a NAS.

Having a RAID6 for a 16 drives is not a popular choice. People often choose RAID50 or RAID60 for that many drives. It speeds up the IOPS and also uses 4 drives for redundancy (8 drives in RAID6 and other 8 drives in RAID6. Both combined together under same volume/pool and called  RAID60 ).

You can alternatively upgrade your existing drives with 16TB HDD. This will effectively double your storage space. I have added instruction bellow. How to replace drives with bigger capacity and how to add additional drives to existing RAID group.

Expanding storage pools by replacing hard disk drives in a RAID array

With this function, RAID group capacity can be expanded by replacing hard disk drives in an array one by one. This option is supported for the following RAID types: RAID 1, RAID 5, RAID 6 and RAID 10. Follow the steps below to expand a RAID group:

Expanding a RAID Group by Replacing all Disks

Expanding a Storage Pool by Adding Disks to a RAID Group

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