> > 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 I am doing this test on a lab cluster, freshly installed, with no activity and almost no data on it. So disks should be standby in-between tests. And I performed various runs, and even if the results are note exactly the same, they are in the same order of magnitude (1% or 2% difference between runs), and the differences between disk vendor are quite high, and consistent between runs. _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx
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