> Op 10 december 2016 om 12:45 schreef Adrian Saul <Adrian.Saul@xxxxxxxxxxxxxxxxx>:
>
>
>
> Hi Ceph-users,
> I just want to double check a new crush ruleset I am creating - the intent here is that over 2 DCs, it will select one DC, and place two copies on separate hosts in that DC. The pools created on this will use size 4 and min-size 2.
>
> I just want to check I have crafted this correctly.
>
I suggest that you test your ruleset with crushtool like this:
$ crushtool -i crushmap.new --test --rule 6 --num-rep 4 --show-utilization
$ crushtool -i crushmap.new --test --rule 6 --num-rep 4 --show-mappings
You can now manually verify if the placement goes as intended.
Wido
> rule sydney-ssd {
> ruleset 6
> type replicated
> min_size 2
> max_size 10
> step take ssd-sydney
> step choose firstn -2 type datacenter
> step chooseleaf firstn 2 type host
> step emit
> }
>
> Cheers,
> Adrian
>
>
>
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