Am 28.02.2018 um 13:58 schrieb Dan van der Ster:
> Hi Stefan,
>
> Which balancer mode are you using? crush-compat scores using a mix of
> nobjects, npgs, and size. It's doing pretty well over here as long as
> you have a relatively small number of empty PGs.
>
> I believe that upmap uses nPGs only, and I haven't tested it enough
> yet to know if it actually improves things.
>
> Also, did you only run one iteration of the balancer? It only moves up
> to 5% of objects each iteration, so it can take several to fully
> balance things.
crush-compat mode
Yes only one iteration but i set max_misplaced to 20%:
"mgr/balancer/max_misplaced": "20.00",
>
> -- dan
>
>
> On Wed, Feb 28, 2018 at 1:47 PM, Stefan Priebe - Profihost AG
> <s.priebe@xxxxxxxxxxxx> wrote:
>> Hello,
>>
>> with jewel we always used the python crush optimizer which gave us a
>> pretty good distribution fo the used space.
>>
>> Since luminous we're using the included ceph mgr balancer but the
>> distribution is far from perfect and much worse than the old method.
>>
>> Is there any way to tune the mgr balancer?
>>
>> Currently after a balance we still have:
>> 75% to 92% disk usage which is pretty unfair
>>
>> Greets,
>> Stefan
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