Hi Sage, Dan ,
When I tried to execute cmd " osdmaptool --test-map-object
"anyrandomname" osdmap " it still shows some random number as mapped
osds. Because I havnt created Object even for that result is shown as
some random numbers/ as osds where that Object is mapped.
And with replication factor of 3 , I think " osdmaptool
--test-map-object Objname osdmap" should show 3 nodes at least . But
currently it shows only 1 node .
Please help me out .
Thanks & Regards,
Hemant Surale.
On Wed, Sep 26, 2012 at 2:59 AM, Sage Weil <sage@xxxxxxxxxxx> wrote:
> On Tue, 25 Sep 2012, Dan Mick wrote:
>> Hemant:
>>
>> Yes, you can. Use ceph osd getmap -o <file> to get the OSD map, and then use
>> osdmaptool --find-object-map <objectname> <file> to output the
>> PG the object hashes to and the list of OSDs that PG maps to (primary first):
>>
>> $ ceph osd getmap -o osdmap
>> got osdmap epoch 59
>> $ osdmaptool --test-map-object dmick.rbd osdmap
>> osdmaptool: osdmap file 'osdmap'
>> object 'dmick.rbd' -> 0.69c8 -> [3,1]
>>
>> shows dmick.rbd mapping to pg 0.69c8, which in turn maps to OSDs 3 and 1, 3
>> being the primary.
>
> You can do this more simply with:
>
> ceph osd map <poolname> <objectname>
>
> sage
>
>>
>> On 09/25/2012 02:30 AM, hemant surale wrote:
>> > Hi Community,
>> > Is it possible to identify where exactly primary copy of obj
>> > is stored ? I am using crushmaps to use specific osds for data
>> > placement but i want to knw the primary capoy location. Or I need to
>> > replace pseudo random function by some deterministic function to guide
>> > ceph to utilize specific osd?
>> >
>> >
>> > Regards,
>> > Hemant Surale.
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