Automatic balancing vs supervised optimization

[Massimo Sgaravatto <massimo.sgaravatto@xxxxxxxxx>]

Hi

I have question regarding supervised/automatic balancing using upmap.

I created a  plan in supervised mode, but its score was not expected to improve the data distribution. But the automatic balancer triggered a considerable rebalance. 

Is this normal ? I thought that automatic balancing basically means running from time to time the balancer in supervised mode,

More details on what I tried:

I changed the balancer mode of my luminous cluster from crush-compact to upmap:

ceph balancer off

ceph osd set-require-min-compat-client luminous

ceph osd crush weight-set rm-compat

This triggered some rebalance. When done (i.e. when the status was HEALTH_OK) I issued:

ceph balancer mode upmap

I then tried to run the balancer in supervised mode:

# ceph balancer optimize myplan

# ceph balancer eval myplan

But the returned value was greater than the value returned by "ceph balancer eval"

I then tried with the automatic balancer:

ceph balancer on

which started moving objects improving A LOT the data distribution.

Thanks, Massimo

_______________________________________________
ceph-users mailing list
ceph-users@xxxxxxxxxxxxxx
http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com