Adding node efficient data move.

["Marc Roos" <M.Roos@xxxxxxxxxxxxxxxxx>]

When adding a node and I increment the crush weight like this. I have 
the most efficient data transfer to the 4th node?

sudo -u ceph ceph osd crush reweight osd.23 1 
sudo -u ceph ceph osd crush reweight osd.24 1 
sudo -u ceph ceph osd crush reweight osd.25 1 
sudo -u ceph ceph osd crush reweight osd.26 1 
sudo -u ceph ceph osd crush reweight osd.27 1 
sudo -u ceph ceph osd crush reweight osd.28 1 
sudo -u ceph ceph osd crush reweight osd.29 1 

And then after recovery

sudo -u ceph ceph osd crush reweight osd.23 2
sudo -u ceph ceph osd crush reweight osd.24 2
sudo -u ceph ceph osd crush reweight osd.25 2
sudo -u ceph ceph osd crush reweight osd.26 2
sudo -u ceph ceph osd crush reweight osd.27 2
sudo -u ceph ceph osd crush reweight osd.28 2
sudo -u ceph ceph osd crush reweight osd.29 2

And then after recovery

sudo -u ceph ceph osd crush reweight osd.23 3
sudo -u ceph ceph osd crush reweight osd.24 3
sudo -u ceph ceph osd crush reweight osd.25 3
sudo -u ceph ceph osd crush reweight osd.26 3
sudo -u ceph ceph osd crush reweight osd.27 3
sudo -u ceph ceph osd crush reweight osd.28 3
sudo -u ceph ceph osd crush reweight osd.29 3

Etc.

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