Why it takes 6% of SCM to record the metadata?



I know daos use the SCM to store metadata, I can't find a wiki to describe the details about what and how we stored in the metadata, I guess there must be something like block locations(mapping LBA to PBA) and allocation bookeepers, but I don't understand why it takes so much space? Typically it only takes 0.1% of the SSD space to record metadata in the normal SSD FTL, what's the difference?

And I'm also wondering if the community has some directions on how to use less SCM?


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