CephFS : Kernel/Fuse technical differences

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Hi everyone,

We successfully use Ceph here for several years now, and since recently, CephFS.

From the same CephFS server, I notice a big difference between a fuse mount and a kernel mount (10 times faster for kernel mount). It makes sense to me (an additional fuse library versus a direct access to a device...), but recently, one of our users asked me to explain him in more detail the reason for this big difference...Hum...

I then realized that I didn't really know how to explain the reasons to him !!

As well, does anyone have a more detailed explanation in a few words or know a good web resource on this subject (I guess it's not specific to Ceph but it's generic to all filesystems ?..)

Thanks in advance,
Hervé

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