Need help on cache tier monitoring

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Hi,

I had configured a cache tier with below parameters:
cache_target_dirty_ratio: 0.1
cache_target_dirty_high_ratio: 0.7
cache_target_full_ratio: 0.9

The cache tier did improved the performance much. And I am targeted to keep
the cache tier with only 10% of dirty data. Remaining data ( 80% ) are
clean and ready for evict. I don't want the cache tier enter high flushing
state which impacting the performance. Are there any methods to keep track
the dirty ratio of target cache tier? Which I can plan for adding more OSDs
if the dirty ratio keep floating around 50~70%

Regs,
Icy
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