On Tue, 13 Jan 2015, Sage Weil wrote:
> > 2) Is there any mechanism (that I might have overlooked) to avoid this 
> > situation, by throttling the flush/evict operations on the fly? If not, 
> > shouldn't there be one?
> 
> Hmm, we could have a 'noagent' option (similar to noout, nobackfill, 
> noscrub, etc.) that lets the admin tell the system to stop tiering 
> movements, but I'm not sure that's wht you're asking for...

...and it looks like we already have a 'notieragent' flag that does 
exactly that:

 ceph osd set notieragent

and

 ceph osd unset notieragent

That might be helpful in narrowing down what effect flush/evict operations 
are having...

sage
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