LVM snapshots seem to have extremely poor performance It seems that
dm-thin snapshots use a new implementation:
Another significant feature is support for an arbitrary depth of recursive snapshots (snapshots of snapshots of snapshots ...). The previous implementation of snapshots did this by chaining together lookup tables, and so performance was O(depth). This new implementation uses a single data structure to avoid this degradation with depth. Fragmentation may still be an issue, however, in some scenarios.
dm-thin seems to be pretty bare bones. In the documentation they say that end-users are advised to use lvm2. lvm seems to have
lvm-thin, so I'm wondering whether
dm-thin or whether they are different implementations and they meant that the future version of
lvm (that don't exist yet) might leverage