On Tue, Feb 8, 2022 at 1:04 PM Frank Schilder <frans@xxxxxx> wrote:
> The reason for this seemingly strange behaviour was an old static snapshot taken in an entirely different directory. Apparently, ceph fs snapshots are not local to an FS directory sub-tree but always global on the entire FS despite the fact that you can only access the sub-tree in the snapshot, which easily leads to the wrong conclusion that only data below the directory is in the snapshot. As a consequence, the static snapshot was accumulating the garbage from the rotating snapshots even though these sub-trees were completely disjoint.
So are you saying that if I do this I'll have 1M files in stray?
mkdir /a
cd /a
for i in {1..1000000}; do touch $i; done # create 1M files in /a
cd ..
mkdir /b
mkdir /b/.snap/testsnap # create a snap in the empty dir /b
rm -rf /a/
Cheers, Dan
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