Ah I see, should have look at the “raw” data instead ;-)
Then I agree this very weird?
Best,
Jesper
--------------------------
Jesper Lykkegaard Karlsen
Scientific Computing
Centre for Structural Biology
Department of Molecular Biology and Genetics
Aarhus University
Universitetsbyen 81
8000 Aarhus C
E-mail: je...@mbg.au.dk
Tlf: +45 50906203
> On 28 Jul 2022, at 12.45, Frank Schilder <fr...@dtu.dk> wrote:
>
> Hi Jesper,
>
> thanks for looking at this. The failure domain is OSD and not host. I typed
> it wrong in the text, the copy of the crush rule shows it right: step choose
> indep 0 type osd.
>
> I'm trying to reproduce the observation to file a tracker item, but it is
> more difficult than expected. It might be a race condition, so far I didn't
> see it again. I hope I can figure out when and why this is happening.
>
> Best regards,
> =================
> Frank Schilder
> AIT Risø Campus
> Bygning 109, rum S14
>
> ________________________________________
> From: Jesper Lykkegaard Karlsen <je...@mbg.au.dk>
> Sent: 28 July 2022 12:02:51
> To: Frank Schilder
> Cc: ceph-users@ceph.io
> Subject: Re: [ceph-users] PG does not become active
>
> Hi Frank,
>
> I think you need at least 6 OSD hosts to make EC 4+2 with faillure domain
> host.
>
> I do not know how it was possible for you to create that configuration at
> first?
> Could it be that you have multiple name for the OSD hosts?
> That would at least explain the one OSD down, being show as two OSDs down.
>
> Also, I believe that min_size should never be smaller than “coding” shards,
> which is 4 in this case.
>
> You can either make a new test setup with your three test OSD hosts using EC
> 2+1 or make e.g. 4+2, but with failure domain set to OSD.
>
> Best,
> Jesper
>
> --------------------------
> Jesper Lykkegaard Karlsen
> Scientific Computing
> Centre for Structural Biology
> Department of Molecular Biology and Genetics
> Aarhus University
> Universitetsbyen 81
> 8000 Aarhus C
>
> E-mail: je...@mbg.au.dk
> Tlf: +45 50906203
>
>> On 27 Jul 2022, at 17.32, Frank Schilder <fr...@dtu.dk> wrote:
>>
>> Update: the inactive PG got recovered and active after a loooonngg wait. The
>> middle question is now answered. However, these two questions are still of
>> great worry:
>>
>> - How can 2 OSDs be missing if only 1 OSD is down?
>> - If the PG should recover, why is it not prioritised considering its severe
>> degradation
>> compared with all other PGs?
>>
>> I don't understand how a PG can loose 2 shards if 1 OSD goes down. That
>> looks really really bad to me (did ceph loose track of data??).
>>
>> The second is of no less importance. The inactive PG was holding back client
>> IO, leading to further warnings about slow OPS/requests/... Why are such
>> critically degraded PGs not scheduled for recovery first? There is a service
>> outage but only a health warning?
>>
>> Thanks and best regards.
>> =================
>> Frank Schilder
>> AIT Risø Campus
>> Bygning 109, rum S14
>>
>> ________________________________________
>> From: Frank Schilder <fr...@dtu.dk>
>> Sent: 27 July 2022 17:19:05
>> To: ceph-users@ceph.io
>> Subject: [ceph-users] PG does not become active
>>
>> I'm testing octopus 15.2.16 and run into a problem right away. I'm filling
>> up a small test cluster with 3 hosts 3x3 OSDs and killed one OSD to see how
>> recovery works. I have one 4+2 EC pool with failure domain host and on 1 PGs
>> of this pool 2 (!!!) shards are missing. This most degraded PG is not
>> becoming active, its stuck inactive but peered.
>>
>> Questions:
>>
>> - How can 2 OSDs be missing if only 1 OSD is down?
>> - Wasn't there an important code change to allow recovery for an EC PG with
>> at
>> least k shards present even if min_size>k? Do I have to set something?
>> - If the PG should recover, why is it not prioritised considering its severe
>> degradation
>> compared with all other PGs?
>>
>> I have already increased these crush tunables and executed a pg repeer to no
>> avail:
>>
>> tunable choose_total_tries 250 <-- default 100
>> rule fs-data {
>> id 1
>> type erasure
>> min_size 3
>> max_size 6
>> step set_chooseleaf_tries 50 <-- default 5
>> step set_choose_tries 200 <-- default 100
>> step take default
>> step choose indep 0 type osd
>> step emit
>> }
>>
>> Ceph health detail says to that:
>>
>> [WRN] PG_AVAILABILITY: Reduced data availability: 1 pg inactive
>> pg 4.32 is stuck inactive for 37m, current state
>> recovery_wait+undersized+degraded+remapped+peered, last acting
>> [1,2147483647,2147483647,4,5,2]
>>
>> I don't want to cheat and set min_size=k on this pool. It should work by
>> itself.
>>
>> Thanks for any pointers!
>> =================
>> Frank Schilder
>> AIT Risø Campus
>> Bygning 109, rum S14
>> _______________________________________________
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