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Monitor - reweight near full osd autonomicly

Summary

Monitor can check osd whose device usage ratio is near full(default ratio 85%), and report "health
err". There is usually one device near full while the others not, so monitor can simply decrease
weight of the near full osd to migrate data to the other osds, which can delay the ratio increase.
This is usefull for administor to extend cluster capcity, especially in a large scale osd cluster.

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Interested Parties

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Current Status

Administor can reweight a near full osd by command. If a series of near full osds
occur in a long time, then the maintain work is heavy.
Detailed Description
The monitor get the log "near full" from the heavy load osd by LogMonitor,
and we can let it to reweight osd.

Work items

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