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I've been reading about BlueStore and I came across the BlueStore
Cache and its ratios. I couldn't fully understand it. Are .99 KV, .01 MetaData and .0 Data ratios right? they seem a little too disproporcionate. Also .99 KV and Cache of 3GB for SSD means that almost the 3GB would be used for KV but there is also another attributed called bluestore_cache_kv_max which is by fault 512MB, then what is the rest of the cache used for?, nothing? shouldnt it be more kv_max value or less KV ratio? I know it really depends on the enviroment (size, amount of IOS, files...) but all of this data seems to me a little too odd and not razonable. Is there any way I can make an aprox about how much KV and metadata is generating for GB of actual data? Does it make anypoint to left some cache for the Data itself or its better to just store ONodes and metadata? Another little question I dont really understand how BlueStore gets its speed from cause it actually writes the data directly to the end device (not like FS where you had a journal), then... shouldnt speed be limitated for that device write speed even having a SSD for RocksDB? Thanks a lot. |
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