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
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