AFAIK, the OSDs should discover their location in the CRUSH map
automatically -- therefore, this "crush location" config override
would be used for librbd client configuration ("i.e. [client]
section") to describe their location in the CRUSH map relative to
racks, hosts, etc.
On Tue, Apr 4, 2017 at 3:12 PM, Brian Andrus <brian.andrus@xxxxxxxxxxxxx> wrote:
> Jason, I haven't heard much about this feature.
>
> Will the localization have effect if the crush location configuration is set
> in the [osd] section, or does it need to apply globally for clients as well?
>
> On Fri, Mar 31, 2017 at 6:38 AM, Jason Dillaman <jdillama@xxxxxxxxxx> wrote:
>>
>> Assuming you are asking about RBD-back VMs, it is not possible to
>> localize the all reads to the VM image. You can, however, enable
>> localization of the parent image since that is a read-only data set.
>> To enable that feature, set "rbd localize parent reads = true" and
>> populate the "crush location = host=X rack=Y etc=Z" in your ceph.conf.
>>
>> On Fri, Mar 31, 2017 at 9:00 AM, Alejandro Comisario
>> <alejandro@xxxxxxxxxxx> wrote:
>> > any experiences ?
>> >
>> > On Wed, Mar 29, 2017 at 2:02 PM, Alejandro Comisario
>> > <alejandro@xxxxxxxxxxx> wrote:
>> >> Guys hi.
>> >> I have a Jewel Cluster divided into two racks which is configured on
>> >> the crush map.
>> >> I have clients (openstack compute nodes) that are closer from one rack
>> >> than to another.
>> >>
>> >> I would love to (if is possible) to specify in some way the clients to
>> >> read first from the nodes on a specific rack then try the other one if
>> >> is not possible.
>> >>
>> >> Is that doable ? can somebody explain me how to do it ?
>> >> best.
>> >>
>> >> --
>> >> Alejandrito
>> >
>> >
>> >
>> > --
>> > Alejandro Comisario
>> > CTO | NUBELIU
>> > E-mail: alejandro@nubeliu.comCell: +54 9 11 3770 1857
>> > _
>> > www.nubeliu.com
>> > _______________________________________________
>> > ceph-users mailing list
>> > ceph-users@xxxxxxxxxxxxxx
>> > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
>>
>>
>>
>> --
>> Jason
>> _______________________________________________
>> ceph-users mailing list
>> ceph-users@xxxxxxxxxxxxxx
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>
>
>
>
> --
> Brian Andrus | Cloud Systems Engineer | DreamHost
> brian.andrus@xxxxxxxxxxxxx | www.dreamhost.com
--
Jason
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