Correct, this should only result in misplaced objects. 

> We made a mistake when we moved the servers physically so while the replica 3 
> is intact the crush tree is not accurate.

Can you elaborate on that? Does this mean after the move, multiple hosts are 
inside the same physical datacenter? In that case, once you correct the CRUSH 
layout, you would be running misplaced without a way to rebalance pools that 
are you using a datacenter crush rule.

Cheers!

--

Matthias Grandl
Head Storage Engineer
[email protected] <mailto:[email protected]>

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> On 12. Jun 2024, at 09:13, Torkil Svensgaard <[email protected]> wrote:
> 
> Hi
> 
> We have 3 servers for replica 3 with failure domain datacenter:
> 
>  -1         4437.29248  root default 
> -33         1467.84814      datacenter 714 
> -69           69.86389          host ceph-flash1 
> -34         1511.25378      datacenter HX1 
> -73           69.86389          host ceph-flash2 
> -36         1458.19067      datacenter UXH 
> -77           69.86389          host ceph-flash3 
> 
> We made a mistake when we moved the servers physically so while the replica 3 
> is intact the crush tree is not accurate.
> 
> If we just remedy the situation with "ceph osd crush move ceph-flashX 
> datacenter=Y" we will just end up with a lot of misplaced data and some 
> churn, right? Or will the affected pool go degraded/unavailable?
> 
> Mvh.
> 
> Torkil
> -- 
> Torkil Svensgaard
> Sysadmin
> MR-Forskningssektionen, afs. 714
> DRCMR, Danish Research Centre for Magnetic Resonance
> Hvidovre Hospital
> KettegÄrd Allé 30
> DK-2650 Hvidovre
> Denmark
> Tel: +45 386 22828
> E-mail: [email protected]
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