question about object replication theory

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hi,all
   take a look at the link ,  http://www.ceph.com/docs/master/architecture/#smart-daemons-enable-hyperscale
could you explain  point 2, 3 in that picture.
 
1.
at point 2,3, before primary writes data  to next osd, where is the data?  it is in momory or on disk already?
 
2. where is the  code of point 2 or 3,  at there  primary distributes data to others?
 
thanks
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