> On Jan 4, 2025, at 10:56 AM, Nicola Mori <m...@fi.infn.it> wrote:
> 
> Ok, will do it after upgrading the two disks of the currently destroyed OSDs 
> on Tuesday.
> In the meantime let me ask another question, to better understand the 
> situation. To the best of my knowledge, the autoscaler and the balancer are 
> two different entities, the former taking care of setting the number off PGs 
> and the latter of distributing them to the OSDs according to the CRUSH rules. 
> If this is correct, then I'd say my issue is with the balancer and not with 
> the autoscaler, unless the problem is that with too few PGs the balancer is 
> unable to distribute them uniformly. Is this correct? If yes, then should I 
> expect that after turning the autoscaler on the number of PGs will be 
> increased and my problem hopefully resolved?

Yes to all of the above.  With too few PGs, the balancer can’t do a very 
uniform job.

Think of an oil drum.  Pack it full of basketballs, or golf balls.


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