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IO performance tuning

Joined
Jun 4, 2017
Messages
35
Hi

Is anyone have any experience with os x io stack tuning ?
I have two block devices - HGST 3.2tb NVME + Areca 1883i (raid0 array with 4 sas drives)
HGST must have read speed near 3.5gb/s
Areca - near 4.5gb/s
But - my read speed is limited to 2.5gb/s (both hgst and areca have the same read speed). Seems that bottleneck is only on read operations.
I've also tried to make software raid0 with two HGST NVME drives - read speed remains the same - 2.5gb/s, but write speed doubles.

Anyone have ideas how to tune IO stack in order to have normal read speed ?
 
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