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From: Don Y <blockedofcourse@foo.invalid>
Newsgroups: sci.electronics.design
Subject: Re: SAS expander
Date: Sun, 10 Nov 2024 12:48:51 -0700
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On 11/10/2024 10:32 AM, Grant Taylor wrote:
> On 11/9/24 14:26, Don Y wrote:
>> AFAICT, a SAS expander should also support SATA drives.  Can anyone confirm 
>> that -- or, is it an "implementation defined" condition? (I have external 
>> enclosures thusly enabled)
> 
> I'm 80% certain that you can put a SATA drive on a SAS controller via a SAS 
> expander without any problems.

I have several DAS boxes that a have built-in SAS expanders (to put up to
90 drives on a SAS cable).  But, ALL must be SAS or ALL must be SATA.
I am not sure if that is a requirement of the hardware or firmware
(but it is a reasonable one)

>> And, can anyone recommend an *internal* SAS extender (I don't want/need an 
>> external enclosure as all of the drives are 2.5" SSDs and, thus, considerably 
>> smaller than 3.5" magnetic disk slots) that would handle a dozen or more?
> 
> I've seen multiple half height and full height 5-1/4 bay modules that will 
> accept multiple 2-1/2 inch drives.  The half height versions could hold six 
> drives horizontally and the full height versions could hold many more vertically.

Do these just mechanically package the drives?  Or, do they include a
SAS expander and present to the host as a SAS interface?  (that would
be cool!)

> Check out the usual electronic haunts; Amazon, ebay, etc.  I like Amazon in 
> that as a Prime member, it's quite easy to return something (in good condition) 
> if it doesn't work.

Thanks!