Re: effectively reducing scrub io impact

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Hello,

On Thu, 20 Oct 2016 15:03:02 +0200 Oliver Dzombic wrote:

> Hi Christian,
> 
> thank you for your time.
> 
> The problem is deep scrub only.
> 
> Jewel 10.2.2 is used.
>
Hmm, I was under the impression that the unified queue in Jewel was
supposed to stop scrubs from eating all the I/O babies.
 
> Thank you for your hint with manual deep scrubs on specific OSD's. I
> didnt come up with that idea.
> 
It's been discussed here before, including the feature request to set the
"last scrubbed" values with an external tool, so that you DON'T
actually have to kick off a scrub to get the desired timing. 

> -----
> 
> Where do you know
> 
> osd_scrub_sleep
> 
> from ?
> 
Reading more or less every article here for the last 3 years and
definitely reading release notes religiously. 

> I am saw here lately on the mailinglist multiple times many "hidden"
> config options. ( while hidden is everything which is not mentioned in
> the doku @ ceph.com ).
> 
Lots of that going on, including massive behavior changes like to one in
cache-tiering from Hammer to Jewel that aren't pointed out or the new
parameters that control them.

Christian

> ceph.com does not know about osd_scrub_sleep config option ( except
> mentioned in (past) release notes )
> 
> The search engine finds it mainly in github or bugtracker.
> 
> Is there any source of a (complete) list of available config options,
> useable by normal admin's ?
> 
> Or is it really neccessary to grab through source codes and release
> notes to collect that kind information on your own ?
> 


-- 
Christian Balzer        Network/Systems Engineer                
chibi@xxxxxxx   	Global OnLine Japan/Rakuten Communications
http://www.gol.com/
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