Hi Team,

I have a Supermicro X10DRL-C 3U server and currently it has below 2 free PCIE slots.

CPU1 SLOTS PCI-E 3.0 X8
CPU1 SLOTS PCI-E 3.0 X16

 

1)  Western Digital 2TB WD Blue 3D NAND Internal PC SSD - SATA III 6 Gb/s, 2.5"/7mm, Up to 560 MB/s - WDS200T2B0A
2) LSI Broadcom SAS 9300-8i 8-port 12Gb/s SATA+SAS PCI-Express 3.0 Low Profile Host Bus Adapter

 

The server has 9300-8i HBA controller and connected with 8 WD SATA3 SSD 2TB disks.

Performance testing:- When LSI HBA 9300-8i connected with CPU1 SLOTS PCI-E 3.0 X8

8 lanes x 560MB/s   == 4,480 MB/s

PCIe 3.0 has an high overhead, max usable I can expect alteast 3800 MB/s

So 3800 MB/s / 8 SATA SSD   = 475MB/s per drive

The above calculation is right?

Can we use CPU1 SLOTS PCI-E 3.0 X16 for SAS 9300-8i for get more performance?
16 lanes x 560MB/s   == 8,960 MB/s

So 8960 MB/s / 8 SATA SSD   =  1120 MB/s per drive. Im wrong. This calculation is going above drive speed(560 MB/s) ??

Thank you,
Raj
 

Edited April 13, 20215 yr by srmvel
mistake

You should get around 8 x 550MB/s on either slot, since the HBA is x8, more info below. 

 

 

Thanks JorgeB again for your valuable reply. Yes I checked your community only to get the details.It was helpful.

 

I hope,my mentioned calculation is correct.

Performance testing:- When LSI HBA 9300-8i connected with CPU1 SLOTS PCI-E 3.0 X8

8 lanes x 560MB/s   == 4,480 MB/s

So 4480 MB/s / 8 SATA SSD   = 560 MB/s per drive(i.e 550 MB/s as per your above reply)

 

In this case ,i cannot use x16 lanes for LSI HBA 9300-8i.

 

Can we use CPU1 SLOTS PCI-E 3.0 X16 for SAS 9300-8i for get more performance?

 

Thanks,

Raj
 

 

1 hour ago, srmvel said:

8 lanes x 560MB/s   == 4,480 MB/s

Max theoretical performance is 8 x 600MB/s, but in practice and due to overhead you should get 550/560MB/s max.

 

1 hour ago, srmvel said:

Can we use CPU1 SLOTS PCI-E 3.0 X16 for SAS 9300-8i for get more performance?

You can use the slot but performance will be the same, since it will still link @ x8, even if it linked at x16 performance with 8 drives would be the same, since the limit here is the SATA speed.

 

Hi JorgeB, Thanks much for your clarification. You cleared my doubt. 

Edited April 13, 20215 yr by srmvel
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