> Op 12 december 2016 om 9:08 schreef Adrian Saul
> <adrian.s...@tpgtelecom.com.au>:
>
>
>
> Thanks Wido.
>
> I had found the show-utilization test, but had not seen show-mappings - that
> confirmed it for me.
>
One thing to check though. The number of DCs is a fixed number right? You will
always have two DCs with X hosts.
In that case:
step choose firstn 2 type datacenter
step chooseleaf firstn -2 type host
First, take 2 of the type 'datacenter' and then find the remaining hosts. But
since you will always use size = 4 you might even try:
rule sydney-ssd {
ruleset 6
type replicated
min_size 4
max_size 4
step take ssd-sydney
step choose firstn 2 type datacenter
step chooseleaf firstn 2 type host
step emit
}
This way the ruleset will only work for size = 4.
Wido
> thanks,
> Adrian
>
>
> > -----Original Message-----
> > From: Wido den Hollander [mailto:w...@42on.com]
> > Sent: Monday, 12 December 2016 7:07 PM
> > To: ceph-users@lists.ceph.com; Adrian Saul
> > Subject: Re: [ceph-users] Crush rule check
> >
> >
> > > Op 10 december 2016 om 12:45 schreef Adrian Saul
> > <adrian.s...@tpgtelecom.com.au>:
> > >
> > >
> > >
> > > 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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