- Why it takes 6% of SCM to record the metadata?
Re: Why it takes 6% of SCM to record the metadata?
DAOS is using both SCM and SSD for application dataset, so the 6% is not just for system metadata of DAOS, it is also for user/application metadata and small data. For example, keys and small values(<4k) of KV store,
inode and small files of POSIX container, …
email@example.com <firstname.lastname@example.org> on behalf of cheneydeng via groups.io <cheneydeng@...>
Date: Monday, October 25, 2021 at 3:00 PM
To: email@example.com <firstname.lastname@example.org>
Subject: [daos] 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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