[OmniOS-discuss] SATA SSD vs. SAS

[matthew lagoe]

Most people who care about uptime and want to avoid problems don't mix sas 
and SATA however if you do want to mix them I would recommend using onboard 
SATA ports or a SATA expander for just the sata drive

That said you can mix them and potentially not have issues however the 
likelihood of problems is significantly greater

Nate Smith <nsmith at careyweb.com> wrote:

Recently purchased a large number of 480GB datacenter grade SSDs with the 
idea to make a ZPOOL for a VM infrastructure. After receiving, I realized 
that they are SATA and not SAS, and that I'd completely overlooked that 
fact. I was planning on using them in a DELL R720XD which only uses two SAS 
cables for 24x2.5" disks.  Since this backplane is obviously a SAS 
expander/multiplier, it will probably lead to disastrous results with SATA 
drives. Everything I've read says "don't use SAS expanders with SATA 
drives." (not to mention, that I'll completely saturate the data paths with 
these).  In that vein, I've got a few  questions.

People choose SATA for SSD, because when it comes to SSD, the price may be 
4-10 times as much for SAS. I've seen lots of setups with SAS spinning 
disks and SATA for L2ARC or ZIL.  How are people connecting SATA disks for 
just these tasks and avoiding problems? Straight onto the SATA port on the 
motherboard?  Are there any SATA only controllers that work well for SSD on 
Omnios?

Does anyone know of any JBODs that are expander/multiplier free that would 
work for this setup? I have had a hard time finding any.

Has anyone had any luck with interposers? I read this report, and it 
sounded promising till I got to the end. 
http://xnat.org/blog/xnat-hardware/rsf-1-high-availablity-ssd-pool-for-vm-st
orage-and-build-space/

Thanks in advance,

--
Nate Smith

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