What the ceph do when detecting one OSD overloaded?

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Hi buddies,

  I am doing investigation on Ceph and Swift,and I am newbie to Ceph.

I am unclear to the behaviour of the Ceph when there is overload situation.
According to the doc, when Ceph do CRUSH, if it find the OSD is overload,
it will skip it to select the other OSD. It means if the OSD don't get
overloaded
the object should be put in this OSD. So how about the original on put on
this OSD when it is not get overloaded?
Can we read it ? When doing CRUSH , the OSD will be skip.

If my understanding is wrong, please correct me.

Best Regards,
zou
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