I've got an LSI SAS9211-8i heading my way.  I'll be dropping it into a H67 Mobo that has 2 x SATAIII and 4 x SATAII.

 

Does anyone know if there is a performance difference between the MoBo SATAIII and the LSI SAS9211-8i ?  Trying to work out if I should put all 8 drives onto the 9277-8i or whether I keep the most used droves, cache and one of the drives assigned to videos, on the mobo ports and the other 6 on the controller.

 

Down the track I might stick a couple of smaller capacity drives for archival purposes on the SATAII ports but they will most likely be outside the array and hopefully not affecting parity check performance.

Just remember your LSI is going to share its PCI path way with all of your drives vs your SATA ports using their own pathways per port. 

Mathematically you could figure out what speed each of your SATA connections have vs the speed of your PCI slot, but you'd have to divide the speed of how many drives you have unless your only accessing one drive per time off the LSI card. 

 

However Math isn't my strong point. Lol

14 minutes ago, dalben said:

Does anyone know if there is a performance difference between the MoBo SATAIII and the LSI SAS9211-8i ? 

 

Same for HDDs, use onboard for SSDs because of trim support.

 

4 minutes ago, kizer said:

Just remember your LSI is going to share its PCI path way with all of your drives vs your SATA ports using their own pathways per port.

 

Only if used on a DMI slot, it will have a dedicated path to the CPU if used on a CPU slot, for an H67 board there will be only one, the GPU slot.

3 minutes ago, johnnie.black said:

 

Only if used on a DMI slot, it will have a dedicated path to the CPU if used on a CPU slot, for an H67 board there will be only one, the GPU slot.

 

So I should use the CPU slot?  These are the specs of my board (P8H67M EVO)

 

1 x PCIe 2.0 x16 (blue) 
1 x PCIe 2.0 x16 (x4 mode, black) 
1 x PCIe 2.0 x1  
1 x PCI

 

Should I assume the CPU slot is the black x4 mode?

I found this rather interesting personally. 

http://www.overclock.net/t/1489684/ssd-interface-comparison-pci-express-vs-sata

3 minutes ago, dalben said:

Should I assume the CPU slot is the black x4 mode?

 

No, that's a DMI slot, i.e. shared with the onboard SATA ports, plus all other PCIe x1 slots, NIC, USB, etc.

 

For your board the CPU slot is the GPU slot, the top one.