About Ceph Cache Tier parameters

["GODIN Vincent (SILCA)" <vincent.godin@xxxxxxxxxxx>]

Hi,

 

In Cache Tier parameters, there is nothing to tell the cache to flush dirty objects on cold storage when the cache is under-utilized (as far as you ‘re under the “cache_target_dirty_ratio”, it’s look like dirty objects can be keeped in the cache for years). 

That is to say that the flush operations will always start during writes and when we have reached the “cache_target_dirty_ratio” value : this will slow down the current writes IO. 

Are some futur requests planned to improve this behavior ?

Thanks for your response

Vince 

 

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