Hello cephers, 

I would like to know if it is possible to underprovision the ssd disks when 
using with ceph-deploy? 

I would like to leave at least 10% in unpartitioned space on each ssd to make 
sure it will keep stable write performance overtime. In the past, i've 
experienced performance degradation when the ssds were not underprovisioned. 

Many thanks 

Andrei 
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