I am using mergerfs with a pool of 4 disks. I am using the policy "existing path, most free space" and the additional options "defaults,allow_other,direct_io,use_ino,ignorepponrename=true".
Now three of the disks are 86% full, their usage history looks as in attachment "data4". But one disk is only 76% percent full, the usage history is in Attachment "data1". As you can see, even when the usage of the other disk increased heavily during last December, there is no real change for Disk 1.
At first I expected the "existing path" policy to be the problem, but this is *not* the case: the directory where all the new files go is present on every disk.
Any idea what could be the reason for this behaviour?