Hello Dennis,
You can create CRUSH rule to select one of osd as primary as:
rule ssd-primary {
ruleset 5
type replicated
min_size 5
max_size 10
step take ssd
step chooseleaf firstn 1 type host
step emit
step take platter
step chooseleaf firstn -1 type host
step emit
}Above will select a OSD from ssd bucket as Primary and all secondary OSD from bucket platter.
You can find more details about CRUSH map at http://ceph.com/docs/master/rados/operations/crush-map/ .
Regards,
Sudarshan
On Mon, Feb 2, 2015 at 12:12 PM, Dennis Chen <kernel.org.gnu@xxxxxxxxx> wrote:
Hi Sudarshan,
Some hints for doing that ?
--
On Mon, Feb 2, 2015 at 1:03 PM, Sudarshan Pathak <sushan.pth@xxxxxxxxx> wrote:
> BTW, you can make crush to always choose the same OSD as primary.
>
> Regards,
> Sudarshan
>
> On Mon, Feb 2, 2015 at 9:26 AM, Dennis Chen <kernel.org.gnu@xxxxxxxxx>
> wrote:
>>
>> Thanks, I've have the answer with the 'ceph osd map ...' command
>>
>> On Mon, Feb 2, 2015 at 12:50 AM, Jean-Charles Lopez <jelopez@xxxxxxxxxx>
>> wrote:
>> > Hi
>> >
>> > You can verify the exact mapping using the following command: ceph osd
>> > map {poolname} {objectname}
>> >
>> > Check page http://docs.ceph.com/docs/master/man/8/ceph for the ceph
>> > command.
>> >
>> > Cheers
>> >
>> > JC
>> >
>> > While moving. Excuse unintended typos.
>> >
>> >> On Feb 1, 2015, at 08:04, Loic Dachary <loic@xxxxxxxxxxx> wrote:
>> >>
>> >>
>> >>
>> >>> On 01/02/2015 14:47, Dennis Chen wrote:
>> >>> Hello,
>> >>>
>> >>> If I write 2 different objects, eg, "john" and "paul" respectively to
>> >>> a same pool like "testpool" in the cluster, is the primary OSD
>> >>> calculated by CRUSH for the 2 objects the same?
>> >>
>> >> Hi,
>> >>
>> >> CRUSH is likely to place john on an OSD and paul on another OSD.
>> >>
>> >> Cheers
>> >>
>> >> --
>> >> Loïc Dachary, Artisan Logiciel Libre
>> >>
>> >> _______________________________________________
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>> >> ceph-users@xxxxxxxxxxxxxx
>> >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
>> > _______________________________________________
>> > ceph-users mailing list
>> > ceph-users@xxxxxxxxxxxxxx
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>>
>>
>>
>> --
>> Den
>> _______________________________________________
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>
>
Den
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