Hold on: 8+4 needs 12 osds but you only show 10 there. Shouldn't you choose
6 type host and then chooseleaf 2 type osd?
.. Dan
On Thu, May 20, 2021, 1:30 PM Fulvio Galeazzi <fulvio.galeazzi@xxxxxxx>
wrote:
> Hallo Dan, Bryan,
> I have a rule similar to yours, for an 8+4 pool, with only
> difference that I replaced the second "choose" with "chooseleaf", which
> I understand should make no difference:
>
> rule default.rgw.buckets.data {
> id 6
> type erasure
> min_size 3
> max_size 10
> step set_chooseleaf_tries 5
> step set_choose_tries 100
> step take default class big
> step choose indep 5 type host
> step chooseleaf indep 2 type osd
> step emit
> }
>
> I am on Nautilus 14.2.16 and while performing a maintenance the other
> day, I noticed 2 PGs were incomplete and caused troubles to some users.
> I then verified that (thanks Bryan for the command):
>
> [cephmgr@cephAdmCT1.cephAdmCT1 clusterCT]$ for osd in $(ceph pg map
> 116.453 -f json | jq -r '.up[]'); do ceph osd find $osd | jq -r '.host'
> ; done | sort | uniq -c | sort -n -k1
> 2 r2srv07.ct1.box.garr
> 2 r2srv10.ct1.box.garr
> 2 r3srv07.ct1.box.garr
> 4 r1srv02.ct1.box.garr
>
> You see that 4 PGs were put on r1srv02.
> May be this happened due to some temporary unavailability of the host at
> some point? As all my servers are now up and running, is there a way to
> force the placement rule to rerun?
>
> Thanks!
>
> Fulvio
>
>
> Il 5/16/2021 11:40 PM, Dan van der Ster ha scritto:
> > Hi Bryan,
> >
> > I had to do something similar, and never found a rule to place "up to"
> > 2 chunks per host, so I stayed with the placement of *exactly* 2
> > chunks per host.
> >
> > But I did this slightly differently to what you wrote earlier: my rule
> > chooses exactly 4 hosts, then chooses exactly 2 osds on each:
> >
> > type erasure
> > min_size 3
> > max_size 10
> > step set_chooseleaf_tries 5
> > step set_choose_tries 100
> > step take default class hdd
> > step choose indep 4 type host
> > step choose indep 2 type osd
> > step emit
> >
> > If you really need the "up to 2" approach then maybe you can split
> > each host into two "host" crush buckets, with half the OSDs in each.
> > Then a normal host-wise rule should work.
> >
> > Cheers, Dan
> >
>
> --
> Fulvio Galeazzi
> GARR-CSD Department
> skype: fgaleazzi70
> tel.: +39-334-6533-250
>
>
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