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by jauntywundrkind
346 days ago
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> i recommend avoiding any home-brew solution which claims sata but is usb connected. In the Jeff geerling nas thread, there didn't seem to be very much actual material support for warding / scaring people away from USB attached sata. It's worked fine for me for a decade, worked fine for people with vastly bigger setups than mine. I largely regard it as decade old FUD myself, & totally decoupled from the state of things. Works more thanfine for a lot of people. That said, I'd be willing to have some skepticism for some of the Pi hats that do usb-sata bridging, like what you were using. I'd feel much more confident using a more off the shelf dual drive bay product or two. $30 a pop. |
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What I had was a 4 device SATA hat, 2 USB ports bridged on each half of the divide to form the channel for data, GPIO pins were used solely for card control and power distribution. It was clever, but not sensible.
People who construct RAID sets over USB attached devices on discrete ports also wind up in odd places. The device enumeration can be semi random and so you have some logistical barriers to things (ZFS amongst other sane things, writes the ZVOL/DEV information into the structure on disk so which enumerated device it is becomes less important) as well as a power distribution problem. I ran an early version of this using an unpowered USB hub with 4 USB sticks and it was very badly behaved.
When I do my 3-2-1 the removable external ZFS drive is USB-3 connected.