Re: question about rbd_read_from_replica_policy

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On Thu, Apr 4, 2024 at 8:23 AM Anthony D'Atri <aad@xxxxxxxxxxxxxx> 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 <N.Feldt@xxxxxxxxxxx> 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
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