I understood your explaination.
The result of 'ceph osd map <poolname> <filename> ' command always gives only 2 OSDs(1 primary, 1 secondary). But it is not mandatory the objects are stored only in 2 OSDs it should be spreaded many OSDs.
So my doubt is why the command gives this result
Regards
Surya Balan
On Thu, Aug 2, 2018 at 1:30 PM, 赵贺东 <zhaohedong@xxxxxxxxx> wrote:
Hello,
file -> many objects-> many PG(each pg has two copies, because your replication count is two)-> many OSD
pgs can be distributed in OSDs, no limitation for only 2, replication count 2only determine pg copies is 2.
Hope this will help.
> ______________________________
> 在 2018年8月2日，下午3:43，Surya Bala <sooriya.balan@xxxxxxxxx> 写道：
>
> Hi folks,
>
> From the ceph documents i understood about PG and why should PG number should be optimal. But i dont find any info about the below point
>
> I am using cephfs client in my ceph cluster. When we store a file(consider replication count is 2) , it will be splitted into objects and each object will be stored in different PG and each PG will be mapped to a OSD. It means there can be many OSD for a single file . But why are we getting only 2 OSDs by the command 'ceph OSD map'
>
> file -> many objects-> many PG-> many OSD
>
> Is that all objects of a file will be stored in only 2 OSD(in case of replication count is 2)?
>
> Regards
> Surya Balan
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