[OmniOS-discuss] Configuration sanity checking

[Richard Elling]

> On Feb 19, 2016, at 7:14 AM, Trey Palmer <trey at mailchimp.com> wrote:
> 
> 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.

yes, Supermicro has almost  every conceivable option for drive backplanes/centerplanes including straight through wiring (SATA and SAS use the same connector)
  -- richard

> 
>     -- Trey
> 
> 
>> On Friday, February 19, 2016, Bob Friesenhahn <bfriesen at 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
>> bfriesen at simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
>> GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/
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