On Wed, 26 Sep 2012, hemant surale wrote:
> Hi Dan ,
> I have set replication factor to 3 of pool 'newbyh' . Then when i
> tried to execute cmds told by you I got that it reported like
>
> ----------------------------------------------------
> root@third-virtual-machine:~# osdmaptool --test-map-object Obj1 osdmap
> osdmaptool: osdmap file 'osdmap'
> object 'Obj1' -> 0.c3c4 -> [0,1]
> -----------------------------------------------------
>
> I even checked manually the dirs at every node . it shows proper data
> available within osd0,osd1 & osd2 . ( i hve 3 node cluster using VM
> Ceph v0.36 )
>
> So my questions is why in above execution it shows that Obj1 is at
> [0,1] .. it should report all nodes like [0,1,2] .
The --test-map-object is currently somewhat useless because it assumes
pool 0 ('data'), and your object is probably in a different pool.
sage
>
>
>
> -
> Hemant Surale.
>
> On Wed, Sep 26, 2012 at 2:04 AM, Dan Mick <dan.mick@xxxxxxxxxxx> 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.
> >
> >
> > 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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> >
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