I'm monitoring an old laptop running as LAMP server. I have trouble understanding this VFS usage chart (sorry can't include images yet) from monitorix (the monitoring tool I'm using). I don't understand most of the terms I find on the internet, and I don't find a graph like this explained in easy words.
Is it correct that the yellow blocks (dentry) are free spots on the filesystem that can be used by VFS?
The blue blocks (inodes) are free spots on the filesystem that are ready to be used? Does the VFS make these because it expects writing operations?
Seems obvious but still: the pink blocks (files) are filled spots on the filesystem?
The VFS total usage was around 95-96%, goes up and down and ends at 100%. Should I interpret the total VFS usage as a cache that has dentries, inodes and files in it, and it's only a problem when the cache has too much files and not enough dentries to make into inodes?