It's difficult to know exactly how Thunderbolt will behave once you start daisychaining devices. Certainly using a separate PCIe host interface is the best way to ensure trouble-free operation, but everyone is moving over to TB3/USB-C, based on the hype that you can attach multiple monitors, external GPUs and storage all on the one port.
I suspect the truth is that it really depends on a lot of other factors such as cable length, PCI lanes etc, so the only way you can really test it out is by trying it.
As an example, I have a HP laptop with Thunderbolt 3 (USB C) and USB 3 ports, and discovered a strange anomaly that the SSD hard drive connected via Thunderbolt 3 would lose some transfer speed when you connected a mouse to the USB 3 port next to the Thunderbolt port. If I swapped the mouse to the USB 3 ports on the other side of the laptop, all was fine.
Avid's recommendations are probably based on a small sample of machines and configurations, so you may get lucky if you try your particular setup with your I/O box and drive daisychained together. I would also look into the quality of the cable used, and investigate these so-called active cables that have some sort of booster circuitry built in. You may also want to try reversing the order of your devices on the chain.
I've certainly managed to run a setup with a iMac Pro and a Blackmagic Ultrastudio on one TB port, and three Thunderbolt drives (Pegasus and G-RAID) daisychained on the other TB port.
As far as 10Gbit ethernet storage is concerned, I know a few companies that have set up systems like this with QNAP storage NAS, and they're able to have multiple 4K editing workstations running without problems.
The initial outlay for 10Gbit hardware and an 8 drive NAS is going to be be a good deal higher than a few Thunderbolt hubs and cables, but this is the way to go for the future of centralised storage. There's even software available (Indiestor Mimic) which will give you Avid bin locking features.
To get an idea of what 10Gbit can do, have a look at Bob Zelin's FAQ...
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Posted by: bruno@mansi.demon.co.uk
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