It's a whole world, especially with fast transfer speeds. I recommend you seek paid advice
Need a lot more context such as types of files you are transferring. Is it video files, or word docs
checksums are typically calculated client side. The server will do its own thing re raid/parity.
Eg if you were doing video files I'd recommend Hedge for Mac. If you are windows I'd recommend Terracopy Pro but avoid on Mac
You'll want a separate network, 10G or more for fast transfer speeds, ofc speeds are limited by your raid. How many people need to be connected to it?
If just you can have a separate 10G network card on your server, and then an external Sonnet 10G Thunderbolt 3 adapter for your MacBook or however you are connected to the serve
If more then you need a network switch
I wouldn't use a Mac as a host with drivers I would build a separate Linux system for your server with the drives connected. You can then share the storage pools over the network via smb or nfs
Truenas is a good start if you have time to tinker
If you want something really easy I'm selling a Synology disk shelf and expansion, holds 12 disks each, super easy gui
He is wrong about Hedge, it's fantastic software. Copied petabytes through it without error
Hedge does source verification which is legit, it checksums in ram, but so does all xx64 that's why faster ram helps re your question about using a Mac mini
The chance of a non ecc ram error is incredibly low. And worthit for the speed advantage, you don't need to generate another destination checksum afterwards, it does it at the same time so won't reallllyyy be reading from the array.
If you want pure speed I would get a large nvme cache. 2x 4TB ssds in raid 0 means it can hold 2/3 large arri mags before it starts to transfer to the disks
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