My understanding is that when you ask an OSD to bench (via the admin socket), 
only that OSD executes, there is no replication.  Replication is a function of 
PGs.

Thus, this is a narrowly-focused tool with both unique advantages and 
disadvantages.



> On Dec 26, 2022, at 12:47 PM, hosseinz8...@yahoo.com wrote:
> 
> Hi experts,I want to know, when I execute ceph tell osd.x bench command, is 
> replica 3 considered in the bench or not? I mean, for example in case of 
> replica 3, when I executing tell bench command, replica 1 of bench data write 
> to osd.x, replica 2 write to osd.y and replica 3 write to osd.z? If this is 
> true, it means that I can not get benchmark of only one of my OSD in the 
> cluster because the IOPS and throughput of 2 other for example slow OSDs will 
> affect the result of tell bench command for my target OSD.Is that true?
> Thanks in advance.
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