I was in disk health and I noticed that the disk speeds shown varied and was wondering if someone could help explain why it is what it is.

 

I have 12 disks installed: /sdb thru /sdm

 

Disks /sdb thru /sdg are connected to Sata 6.0 Gb/s ports on the mobo

 

Disks /sdh and /sdi are connected to a Vantec UGT-ST622 2-Channel 4-Port SATA 6Gb/s PCIe Host Card. The disks are connected to the 2 internal ports.

 

Disks mentioned above are all connected at 6.0 Gb/s per SMART

 

The remaining drives are connected a Supermicro Add-on Card AOC-USAS2-L8i which, via SAS cable, connects to a Chenbro Drive Expander CK22803. These devices are all rated for 6.0 Gb/s per port.

 

All the remaining drives, per SMART, are all connected at 1.5 Gb/s per port.

 

Now...I ordered SAS cables from monoprice.com. I used a 1m 30AWG Internal Mini SAS 36pin (SFF-8087) Male to Mini SAS 36pin (SFF-8087) Male Cable to connect the 0-3 port of the Supermicro Add-on card to the CNB1 connector of the Chenbro Expander. I then used 2x - 1m 30AWG Internal Mini SAS 36pin (SFF-8087) Male w/ Latch to SATA 7pin Female (x4) Forward Breakout Cables from the Chenbro Expander to the HDDs.

 

Am I missing something? Please advise.

 

Version: 5.0.5

Syslog Attached

FugginSyslog.txt

Is it just the difference in SATA speeds that has you concerned? (6.0/3.0/1.5 ?)

Or is there something else going on?

 

 

I just keep my Cache and Parity drives on my 6 Gig SATA connections, and don't worry about the rest.

 

The consensus is that if its just the reported SATA connection speeds, then you shouldn't worry.

Even a 1.5 Gig connection will saturate a hard drive's ability to write data.

And if you're reading, you're constrained by your Gig-E network.

I am concerned because I bought my hardware so that everything was 6.0 and yet everything I have on the Chenbro controllers are running at 1.5. Just trying to figure out why.