Re: how ceph OSD bench works?

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> 
> OSD bench performs IOs at the objectstore level and the stats are
> reported
> based on the response from those transactions. It performs either
> sequential
> or random IOs (i.e. a random offset into an object) based on the
> arguments
> passed to it. IIRC if number of objects and object size is provided, a
> random
> offset into an object is written.
> 
> Therefore, depending on the parameters passed, sequential or random
> offset
> is determined and this obviously would result in different measurements.
> 
> 

Do you know if it tries and do this on times where the osd is not being actively used or waits until there is no activity? I have been testing a bit recently and noticed that some ssd's of the same type are reporting significantly different values like 117 and 90
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