In memory metadata overhead

[hagh...@gmail.com]

Hello, 

I was wondering how big is the overhead of the dm-cache metadata in the RAM ? In other words how much is the metadata size for each 4KB data blocks ? 

I have no idea about the in memory data structure that dm-cache used to find the answer of this question. 

Thanks

Alireza

[Dulcardo Arteaga]

Hello Alireza,

I have a pdf describing the size of the structures, basically

for a cache size of 64GB you need 512MB of memory.

more detail in the attached file

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