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Suse openSUSE 12.2 Manual

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in the original le system is modied, changed data blocks are copied while the old
data blocks are kept for the snapshot. Therefore, a snapshot occupies the same amount
of space as the data modied. So, over time, the amount of space a snapshot allocates,
constantly grows. As a consequence, deleting les from a Btrfs le system containing
snapshots may not free disk space!
NOTE: Snapshot Location
Snapshots always reside on the same partition or subvolume that has been
snapshotted. It is not possible to store snapshots on a different partition or
subvolume.
As a result, partitions containing snapshots need to be larger than “normal” partitions.
The exact amount strongly depends on the number of snapshots you keep and the amount
of data modications. As a rule of thumb you should consider using twice the size than
you normally would.
TIP: Freeing space / Disk Usage
In order to free space on a Btrfs partition containing snapshots you need to
delete unneeded snapshots rather than les. Older snapshots occupy more
space than recent ones.
Since the df does not show the correct disk usage on Btrfs le systems, you
need to use the command btrfs filesystem df MOUNT_POINT. Display-
ing the amount of disk space a snapshot allocates is currently not supported
by the Btrfs tools.
4.2 Using Snapper to Undo YaST and
zypper Changes
If you set up the root partition with Btrfs during the installation, Snapper—pre-con-
gured for doing rollbacks of YaST or zypper changes—will automatically be installed.
Every time you start a YaST module or a zypper transaction, two snapshots are created:
a “pre-snapshot” capturing the state of the lesystem before the start of the module and
a “post-snapshot” after the module has been nished.
98 Reference
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