[ceph-users] Re: question about rbd_read_from_replica_policy

[Gregory Farnum]

On Thu, Apr 4, 2024 at 8:23 AM Anthony D'Atri  wrote:
>
> Network RTT?

No, it's sadly not that clever. There's a crush_location configurable
that you can set on clients (to a host, or a datacenter, or any other
CRUSH bucket), and as long as part of it matches the CRUSH map then it
will feed IOs to OSDs within that CRUSH domain.
-Greg

>
> > On Apr 4, 2024, at 03:44, Noah Elias Feldt  wrote:
> >
> > Hello,
> > I have a question about a setting for RBD.
> > How exactly does "rbd_read_from_replica_policy" with the value "localize" 
> > work?
> > According to the RBD documentation, read operations will be sent to the 
> > closest OSD as determined by the CRUSH map. How does the client know 
> > exactly which OSD I am closest to?
> > The client is not in the CRUSH map. I can't find much more information 
> > about it. How does this work?
> >
> > Thanks
> >
> >
> > noah feldt
> > infrastrutur
> > _
> >
> >  > OWAPstImg85013815377039-2715-4125-ae27-665645666b62.png>
> >
> > Mittwald CM Service GmbH & Co. KG
> > Königsberger Straße 4-6
> > 32339 Espelkamp
> >
> > Tel.: 05772 / 293-100
> > Fax: 05772 / 293-333
> >
> > supp...@mittwald.de 
> > https://www.mittwald.de 
> >
> > Geschäftsführer: Robert Meyer, Florian Jürgens
> >
> > USt-IdNr.: DE814773217, HRA 6640, AG Bad Oeynhausen
> > Komplementärin: Robert Meyer Verwaltungs GmbH, HRB 13260, AG Bad Oeynhausen
> >
> > Informationen zur Datenverarbeitung im Rahmen unserer Geschäftstätigkeit
> > gemäß Art. 13-14 DSGVO sind unter www.mittwald.de/ds 
> >  abrufbar.
> >
> >
> >
> >
> > ___
> > ceph-users mailing list -- ceph-users@ceph.io 
> > To unsubscribe send an email to ceph-users-le...@ceph.io 
> > 
> ___
> ceph-users mailing list -- ceph-users@ceph.io
> To unsubscribe send an email to ceph-users-le...@ceph.io
___
ceph-users mailing list -- ceph-users@ceph.io
To unsubscribe send an email to ceph-users-le...@ceph.io

[ceph-users] Re: question about rbd_read_from_replica_policy

[Anthony D'Atri]

Network RTT?

> On Apr 4, 2024, at 03:44, Noah Elias Feldt  wrote:
> 
> Hello,
> I have a question about a setting for RBD.
> How exactly does "rbd_read_from_replica_policy" with the value "localize" 
> work?
> According to the RBD documentation, read operations will be sent to the 
> closest OSD as determined by the CRUSH map. How does the client know exactly 
> which OSD I am closest to?
> The client is not in the CRUSH map. I can't find much more information about 
> it. How does this work?
> 
> Thanks
> 
> 
> noah feldt
> infrastrutur
> _
> 
>  OWAPstImg85013815377039-2715-4125-ae27-665645666b62.png>
> 
> Mittwald CM Service GmbH & Co. KG
> Königsberger Straße 4-6
> 32339 Espelkamp
>  
> Tel.: 05772 / 293-100
> Fax: 05772 / 293-333
>  
> supp...@mittwald.de 
> https://www.mittwald.de 
>  
> Geschäftsführer: Robert Meyer, Florian Jürgens
>  
> USt-IdNr.: DE814773217, HRA 6640, AG Bad Oeynhausen
> Komplementärin: Robert Meyer Verwaltungs GmbH, HRB 13260, AG Bad Oeynhausen
> 
> Informationen zur Datenverarbeitung im Rahmen unserer Geschäftstätigkeit 
> gemäß Art. 13-14 DSGVO sind unter www.mittwald.de/ds 
>  abrufbar.
> 
> 
> 
> 
> ___
> ceph-users mailing list -- ceph-users@ceph.io 
> To unsubscribe send an email to ceph-users-le...@ceph.io 
> 
___
ceph-users mailing list -- ceph-users@ceph.io
To unsubscribe send an email to ceph-users-le...@ceph.io