On 19/01/2016 05:19, Francois Lafont wrote:
> However, I still have a question. Since my previous message, supplementary
> data have been put in the cephfs and the values have changes as you can see:
>
> ~# du -sh /mnt/cephfs/
> 1.2G /mnt/cephfs/
>
> ~# du --apparent-size -sh /mnt/cephfs/
> 6.4G /mnt/cephfs/
>
> You can see that the difference between "disk usage" and "apparent size"
> has really increased and it seems to me curious that only sparse files can
> explain this difference (in my mind, sparse files are very specific files
> and here the files are essentially images which doesn't seem to me potential
> sparse files). I'm not completely sure but I think that same files are put in
> the cephfs directory.
>
> Do you think it's possible that the sames file present in different directories
> of the cephfs are stored in only one object in the cephfs pool?
>
> This is my feeling when I see the difference between "apparent size" and
> "disk usage" which has increased. Am I wrong?
In fact, I'm not so sure. Here another information, where /backups is a XFS partition:
~# du --apparent-size -sh /mnt/cephfs/0/5/05286c08-2270-41e7-8055-64eae169bd46/data/
2.8G /mnt/cephfs/0/5/05286c08-2270-41e7-8055-64eae169bd46/data/
~# du -sh /mnt/cephfs/0/5/05286c08-2270-41e7-8055-64eae169bd46/data/
701M /mnt/cephfs/0/5/05286c08-2270-41e7-8055-64eae169bd46/data/
~# cp -r /mnt/cephfs/0/5/05286c08-2270-41e7-8055-64eae169bd46/data/ /backups/test
~# du -sh /backups/test
701M /backups/test
~# du --apparent-size -sh /backups/test
701M /backups/test
So I definitively don't understand of du --apparent-size -sh...
--
François Lafont
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