planning general storage capacity for y fs

[Dolev Raviv]

Hi,
I'm looking for guidelines for planning storage capacity. I understand it
strongly depended on the usage type.
I want to know at what point storage fullness is effecting performance in a
standard read/write partition. Do different File Systems (UBIFS/EXT4) have
different full-free ratio?
What about read only fs? Can I plan less free space in such cases?

I'll appreciate any input on this, for UBIFS specific and fs in general.

Thanks,
Dolev
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