Re: Ceph benchmarks

[Mark Nelson <mark.nelson@inktank.com>]

On 08/27/2012 03:47 PM, Sébastien Han wrote:
> Hi community,
>

Hi!

> For those of you who are interested, I performed several benchmarks of
> RADOS and RBD on different types of hardware and use case.
> You can find my results here:
> http://www.sebastien-han.fr/blog/2012/08/26/ceph-benchmarks/
>
> Hope it helps :)
>
> Feel free to comment, critic... :)

A couple of thoughts:

1) With so few OSDs going from 1000 to 10000 pgs shouldn't make too much 
of a difference.  It would be concerning if it did!

2) Were the commodity results with SSDs using replication of 3?  Also, 
was that test with the flusher on or off?  I'd hope that with 15k drives 
you'd see a bit better throughput with journals on the SSDs.

3) It would be interesting to try these tests without the raid1 and see 
if you can max out the bonded interface.

4) I think the R520 backplane is using SAS expanders like in the R515s 
we have.  We've had some performance problems caused either by them or 
by something goofy going on with our H700 controllers.

5) rados bench tests with smaller requests could be interesting on 15k 
drives.  I typically see about 1-2MB/s per OSD for 4k requests with 
7200rpm SATA disks.

Mark

>
> Cheers!
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