The firmware update went nice, but nothing change. I finally do a raid 0 of each drives in my P410i array manager, so now it’s showing up in truenas, but I can’t do it to my 1TB one, so I guess I will leave this like that. To flash the firmware I used unetbootin and I download the firmware updater (the last compatible for Proliant ML350 Gen 6) here : “HP SPP 2017.04.0 ISO : HP : Free Download, Borrow, and Streaming : Internet Archive” (if you’re interessed). I will mark this as resolved…