RE: SAS 6/iR Integrated SAS + SATA (SSD) Negotiated speed PE1950
I have a Dell T7500 (SAS 6/iR) and tried installing 2 Samsung 840 EVOs in RAID 0. I am not an IT specialist so it took some time to understand why the read/write performance was only ~250Mbps. I expected to see double that with SATA 2 in RAID 0 (2 x 300Mbps).
Finally I figured out that the SSDs negotiate at 1.5 (SATA 1) while my backup HDD negotiates at 3 (SATA 2).
I tried updating firmware, BIOS, etc. and had practically given up on finding a solution until you mentioned interposers, which I hadn't heard of before. A bit of internet searching led me to find this:
'Dell Precision T7500 SAS to SATA Interposer Board Converter M199P'
Is this the correct part (it costs $9!) or do I need something else? How do I connect it up?
Any help would be much appreciated.