Onboard SATA vs. controller card


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I am planning on moving my unRAID to a Supermicro X10SDV motherboard and install a flashed Dell Perc H310 controller card. The mb is limited to 6 SATA connections, while the H310, which will sit in a PCIE 3.0 x 16 slot, will support 8 SATA drives. I'm intending to have 2 parity disks, 5 data disks and perhaps 2 SSDs for a cache pool.

 

Will it make any difference whether I connect disks to the mb or the H310? My main objective is to minimise the time for parity checks. So, for example, would it be better to share the hard drives between onboard SATA and the H310, or to have, say, all the hard drives on the H310? Or would it not make any difference? Is there anything else I should consider when allocating the drives and SSDs to the onboard SATA and the H310?

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