Workload performance varying between 2 executions

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Good morning. 

I just setup a ceph environment, 9 storage nodes 

and i mount it on a cephfs on a 10th independent node. 

I execute a fio workload once i got a 3Mb/s throughput. 

When i reexecute the same workload after a certain time i got this time
a 9Mb/s throughput. 

Do you know why this is happening ? 

Cordially,

-- 
Nguetchouang Ngongang Kevin
ENS de Lyon
https://perso.ens-lyon.fr/kevin.nguetchouang/
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