search for: ddsnap

At the beginning of August, Mikulas Patocka posted to linux-kernel mailing list about adding snapshot merging to LVM[1]. Basicaly, snapshot merging means that it is possible to turn a snapshot back into its origin. Using LVM, however, means that you need to have free place outside of the filesystem (i.e., in physical volume) to make snapshots, which is not always possible on workstations and

...ile and per-directory versioning seems attractive, as does the elegant formulation of snapshots-of-snapshots and the compact metadata. I suspect that less updating of metadata will be required for writes versus either Btrfs or ZFS. Mind you, there is no working filesystem code at the moment, only ddsnap the snapshotting block device and the attached proof of concept of versioned pointers, so some of this is speculation. I described earlier how versioned pointers will be extended to versioned extents but have not yet tried it. This would be necessary in order to operate in the same ballpark of ef...

...ile and per-directory versioning seems attractive, as does the elegant formulation of snapshots-of-snapshots and the compact metadata. I suspect that less updating of metadata will be required for writes versus either Btrfs or ZFS. Mind you, there is no working filesystem code at the moment, only ddsnap the snapshotting block device and the attached proof of concept of versioned pointers, so some of this is speculation. I described earlier how versioned pointers will be extended to versioned extents but have not yet tried it. This would be necessary in order to operate in the same ballpark of ef...