Hi, If I have an 1GB RBD image and format it with say xfs of ext4, then I basically have thin provisioned disk. It takes up only as much space from the Ceph pool as is needed to hold the data structure of the empty file system.
If I add files to my file systems and then remove them, how does Ceph deal with these "freed" blocks? At the file system level the pointers to the blocks get removed from the dir tree and the blocks get added to the free list for potential use by other files. I'm assuming Ceph/RBD doesn't have any direct awareness of this since the file system doesn't traditionally have a "give back blocks" operation to the block device. Is there anything special RBD does in this case that communicates the release of the Ceph storage back to the pool? Sorry for any gross oversimplifications. ~jpr _______________________________________________ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
