On Mon, May 28, 2018 at 1:50 PM, Fulvio Galeazzi
wrote:
> Hallo,
> I am using 12.2.4 and started using "ceph balancer". Indeed it does a
> great job, thanks!
>
> I have few comments:
>
> - in the documentation http://docs.ceph.com/docs/master/mgr/balancer/
>I think there is an error, since
> ceph config set mgr mgr/balancer/max_misplaced .07
>should be replaced by
> ceph config-key set mgr/balancer/max_misplaced 0.07
You're reading the "master" branch docs, in which the commands are
different. The luminous docs are here:
http://docs.ceph.com/docs/luminous/
John
> - when running in automatic mode, I observed that althought I set
>max_misplaced to 1%, sometimes the fraction of misplaced PGs goes
>slightly above (up to 1.5% or so): probably because a new round of
>optimization takes place as soon as there are no degraded objects
>but there may still be some misplaced objects around?
>Not a big deal, though, just need to remember to set max_misplaced
>to a bit lower value.
>
> - do you think it would make sense to be able to optionally restrict
>balancer to run only on a given device-class? I have defined a
>custom device class "big" which I use for EC-backed pools, and would
>like to selectively include/exclude those units in/from the
>optimization process.
>
> Thanks a lot!
>
> Fulvio
>
>
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