Re: cephfs small files expansion

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Hey Seb,

> I have a test cluster on which I created pools rbd and cephfs (octopus), when
> I copy a directory containing many small files on a pool rbd the USED part of
> the ceph df command seems normal on the other hand on cephfs the USED part
> seems really abnormal, I tried to change the blocksize
> bluestore_min_alloc_size but it didn't change anything, would the solution be
> to re-create the pool or outright the OSDs?

bluestore_min_alloc_size has an effect only at OSD creation time; if
you changed it after creating the OSDs, it will have had no effect
yet. If your pool is on HDDs and this is pre-Pacific, then the default
of 64k will have a huge amplification effect for small objects.

Josh
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