6Gb/s HBA card link to 12Gb/s 12GB expander backplane, but too slow.

[faqchina]

Previously it was the array card 9220-8i IT mode, using two 8087 to 4 SATA connectors to connect eight hard disks, and the motherboard SATA  connect five hard disks, a total of thirteen hard disks. The system speed is normal. When the array is verified, a single hard disk 100MB / S, total speed 1300MB / S +

 

Now I just replaced the chassis, using  the HBA card 9220-8i , SFF-8087 to SFF-8643 cable and  connected  it to the 12Gb / s Expander backplane。

and the speed is abnormal. The single disk can reach 200MB / S at the fastest, but the entire system can only reach 420M / s.

10 disks are started, each disk Just 42M / s,

start with 5 disks, each disk is 84M / s, the total speed is limited to 420M / s

is a bug or should i change the HBA card?

 

 

[JorgeB]

 

 

For best performance you need a x8 link.

[faqchina]

Thank you for your reply

I tried on different slots PCI-E 3.0 x16, PCIE 3.0 x8 and other motherboards
But always runs at a width of 5GT / s x1

Edited March 3, 2020 by faqchina

[faqchina]

How to set to x8 link？

 

[Shane-O-MAC]

9 hours ago, johnnie.black said:

 

 

For best performance you need a x8 link.

I believe what he meant is you need a second 4 channel cable between your controller/hba and the expander.  You should dual link your hba to the expander which should double your through put.

[ken-ji]

This is what @johnnie.black means by x8 link:

My setup is basically the HBA (LSI 9206-16e) connected to a Areca 4036 (8x enclosure) enclosure via dual SFF 8644 cables.

I guess have more bandwidth available than I have drives...

[JorgeB]

6 hours ago, Shane-O-MAC said:

believe what he meant is you need a second 4 channel cable between your controller/hba and the expander

No, that x1 is the PCIe link speed, and it will be very slow like that for concurrent access, not enough bandwidth, if it's the same on a different board it's likely a controller problem.

[faqchina]

It seems that it is running on PCI-E x1, how to adjust to x8?

[JorgeB]

21 hours ago, johnnie.black said:

if it's the same on a different board it's likely a controller problem.

 

[faqchina]

The system was operating normally before replacing the chassis
Just buy another HBA card and try it

[faqchina]

I will respond to the situation when I change the card

Thank you all

[faqchina]

Works fine after replacing the card