rbd cache on full ssd cluster

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Hello Cephers .

I wonder if anyone has some experience with full ssd cluster .
We're testing ceph ( "firefly" ) with 4 nodes ( supermicro  SYS-F628R3-R72BPT ) * 1TB  SSD , total of 12 osds .
Our network is 10 gig .
We used the ceph_deploy for installation with all defaults  ( followed ceph documentation for integration with open-stack ) 
As much as we understand there is no need to enable the rbd cache as we're running on full ssd .
bench marking the cluster shows very poor performance write but mostly read ( clients are open-stack but also vmware instances ) .
any input is much appreciated ( especially want to know which parameter is crucial for read performance in full ssd cluster ) 

Thanks in Advance
 




Yair Magnezi
Storage & Data Protection TL   // Kenshoo
Office +972 7 32862423   // Mobile +972 50 575-2955
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