I have no experience with that specific device, but on my LSI card installed in my Cisco UCS C210 series server, I started with SATA laptop drives and one by one would mark them as offline and plop in a 600GB SAS 10k drive, and let it build while in the LSI BIOS. I think I have one of the older cards but not the one that has the 2TB size limitation.
I'm surprised, none of the OEM hosts I've worked with will even allow you to select SAS and SATA together much less make an array.
I'd be interested to know if you accomplish this successfully.
Because they don't want to support such a system
Sas and sata devices can handle errors/problems differently (eg: time before reporting a failure to the raid controller) which can result in a corrupt/degraded array.
make sure you understand how the Areca is really handling SATA drives in a mixed SAS array. The older AReca I have worked with could do it, but the SATA drives were SLOW, it was intended for emergency use only until a proper matching SAS drive could be installed.
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