Re: OSD nodes with >=8 spinners, SSD-backed journals, and their performance impact

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On 14/01/2013, at 10:47 PM, Florian Haas <florian@xxxxxxxxxxx> wrote:
<snip>
> http://www.hastexo.com/resources/hints-and-kinks/solid-state-drives-and-ceph-osd-journals
> 
> It's probably easiest to comment directly on that page, but if you
> prefer instead to just respond in this thread, that's perfectly fine
> too.
<snip>


Hi Florian,

Thanks for putting this together.

A couple of minor questions/comments:

* One of the conclusions is to use the SSDs (assuming 2) un-RAIDed, but the article doesn't actually explain why using them in a RAID-1 is a poor idea.

* Should the end of this sentence:
	"Another option is to use, say, one partition on each of your SSD in a RAID for the operating system installation, and then chop up the rest of your SSDs an non-RAIDed Ceph OSDs."

...instead read:

	"Another option is to use, say, one partition on each of your SSD in a RAID for the operating system installation, and then chop up the rest of your SSDs an non-RAIDed Ceph **OSD journals**." ?

Regards,
Tom

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