On 08/19/2015 03:41 PM, Nick Fisk wrote:
Although you may get some benefit from tweaking parameters, I suspect you are nearer the performance ceiling for the current implementation of the tiering code. Could you post all the variables you set for the tiering including target_max_bytes and the dirty/full ratios.
sure, all the parameters set are like this:
hit_set_type bloom
hit_set_count 1
hit_set_period 3600
target_max_bytes 65498264640
target_max_objects 1000000
cache_target_full_ratio 0.95
cache_min_flush_age 600
cache_min_evict_age 1800
cache_target_dirty_ratio 0.75
Since you are doing maildirs, which will have lots of small files, you might also want to try making the object size of the RBD smaller. This will mean less data is needed to be shifted on each promotion/flush.
I'll try that - thanks!
J
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