Hi, just some assumptions based on my experience with cephfs: - you cannot change existing objects; setting a different pool will not automagically move data. the data pool seems to be stored in the inode information - this also explains why changing the pool of a file does not work. ceph is unable to move the data on its own - so after changing the pool for a directory, all existing files will remain in their original pool - only newly created files will inherit the changed pool assignment - moving a file does not create a new inode, so its pool assignment cannot be changed by moving The last time we want to perform a large scale pool change we had to copy each file / directory to actually move the data. Best regards, Burkhard Linke