Xen
2017-04-15 17:48:41 UTC
Short question.
When a snapshot is created of some thin volume its data_percent is
typically the same as for its parent volume.
However that doesn't mean it actually uses those extents for itself.
How can I obtain actual information as to how much extents the thin
volume uses?
I also realized that putting data on a thin volume does not have to
cause the thin snapshot to allocate more of the previous extents were
unused?
So for a thin volume that does not see a lot of data *changes* but only
data *growth* it means all of this data is only allocated once right.
Regards.
When a snapshot is created of some thin volume its data_percent is
typically the same as for its parent volume.
However that doesn't mean it actually uses those extents for itself.
How can I obtain actual information as to how much extents the thin
volume uses?
I also realized that putting data on a thin volume does not have to
cause the thin snapshot to allocate more of the previous extents were
unused?
So for a thin volume that does not see a lot of data *changes* but only
data *growth* it means all of this data is only allocated once right.
Regards.