I haven't checked the Supermicro models lately, but the HP DL380Gen9 has a
model with 24 direct-wired 2.5" slots in 3 modular 8-disk bays. The SAS
expander is an add-in card which you don't have to buy.
It's really excellent for Intel DC s3X10's. Of course it's also more
expensive than a Supermicro.
Hopefully Supermicro has something similar now. Wiring anything SATA
through a SAS expander is a risky practice.
-- Trey
On Friday, February 19, 2016, Bob Friesenhahn <bfrie...@simple.dallas.tx.us>
wrote:
> On Fri, 19 Feb 2016, Peter Tribble wrote:
>
>>
>> So that was an interesting question, and I had to go away and investigate
>> further.
>> So the way this works is that the system has a 24-slot disk backplane.
>> The disks plug
>> into the backplane; you have to connect the backplane as a unit to
>> something, which
>> is where the HBA comes in. It doesn't look like there's a way to wire an
>> individual drive
>> to an onboard SATA port.
>>
>
> These really dense 2U systems are often a pre-packaged (or close to it)
> system from SuperMicro and you get what they (SuperMicro) are able to
> build. The product page usually makes note of that. Your
> integrator/builder is only able to make relatively small changes. Direct
> wiring 24 drives in a 2U system would be crazy.
>
> With SAS driving SATA, it seems like you would still need/want one SAS
> channel per drive and 24 channels is a lot. It sounds like you are getting
> only 8 SAS channels.
>
> Bob
> --
> Bob Friesenhahn
> bfrie...@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
> GraphicsMagick Maintainer, http://www.GraphicsMagick.org/
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