12G spinners vs 6G spinners

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Fritz

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Apr 6, 2015
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Not sure what to make of this.

Chassis is a Supermicro SC836 with a X9SRH-7F MB with a builtin LSI 2308 HBA and a TQ backplane.
It also contains a Supermicro AOC-S3008L-L8E 12G HBA.

Half of the drive bays are connected to the 6G HBA and the other half to the 12G.

There's no difference between the 6G and 12G HBA.

Both tested HD's are empty and are 12G spinners.

However. The score is using the 6G HBA looks very much on the high side compared to 6G spinners so it looks like 6 G spinners can't max out a 6G HBA but a 12G spinner can. Is this right?

If so then 12G HBA's are snake oil unless you use them with SSD's.

1Total 12G.PNG
 

i386

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Mar 18, 2016
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Rerun the test with a larger files (let's say 30+ GByte) and put the hdd in the same slot (and let it "cool off" after each benchmark run). I think the result's will be even closer...
However. The score is using the 6G HBA looks very much on the high side compared to 6G spinners so it looks like 6 G spinners can't max out a 6G HBA but a 12G spinner can. Is this right?
I'm not sure what you mean...
6 GBit/s is ~550MByte/s with encoding and sata+sas tunneling protocol. Nothing in the benchmarks you posted comes close to this number, yet 12 GBit/s
 

Fritz

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I was trying to determine if it made sense to buy 12G spinners and 12 G HBA's going forward. Looks like there's no point in doing so unless there's no price difference.
 

i386

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Fritz

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Just thought of another reason to buy 12G spinners. They tend to be newer. The seagate in this test was practically brand new. 58MB writes and less than a day POT. That is of course if SMART hasn't been monkeyed with.

Just noticed I cut the Seagate off when I took this screen shot. It's a ST6000NM0095.
 

Sean Ho

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Yes, this has always been the case, which is why even the venerable SAS2008 HBAs (9211, H200, etc.) are still just fine for spinners, even SAS3 spinners. No one's being duplicitous; that's just the way the math works out. Once you get past around 20-24 spinners on a single dual-port HBA (with expander), the increased aggregate bandwidth of a SAS3 HBA may be useful.
 
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