understanding PG count for a file

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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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