xfs metadata overhead

[Danny Shavit]

Hi,

We are looking for a method to estimate the size of metadata overhead for a
given file system.
We would like to use this value as indicator for the amount of cache memory
a system for faster operation.
Are there any counters that are maintained in the on-disk data
structures like free space for examples?

-- 
Thank you,
Danny Shavit
Zadarastorage
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