I see that my root gets full of space !?
is that a know problem of btrfs? normaly it get 7GB free space of 15GB in my installs
living-openSUSE:/home/living # btrfs fi show
Label: 'Home' uuid: 986aefdd-5133-46fc-9dc2-d3b70a234183
Total devices 1 FS bytes used 1.38GiB
devid 1 size 10.00GiB used 3.03GiB path /dev/sda2
Label: 'Root' uuid: 801d2a18-b8c2-4dea-811c-cf64cffa8489
Total devices 1 FS bytes used 10.34GiB
devid 1 size 15.01GiB used 13.04GiB path /dev/sda1
no problem with ext4 on three others openSUSE 13.1 RC2
Most people in this forum are waiting until 13.1 is released in a few days Maybe some of them are, like you, testing 13.1 RC2, but they are then here for problems with the current releases and are gathering in the Pre-release/Beta forum to exchange their 13.1 experiences.
btrfs is mostly intended for storage devices >32TB,
its file structure includes back-up,
hence the overheads are much higher than ext4
when trying it out on 16GB stick > 2GB more storage space was lost,
hence expect to loose about 20% of total capacity on small devices
In openSUSE with btrfs a lot of snapshots are created automatically, e.g. per hour and before and after invocations of zypper and yast.
If you delete all these snapshots and wait until the btrfs background workers have done their job, you will get a lot of space back.
If you want to use btrfs better be prepared to have a good number of gigabytes free for this, or switch of all the automatic snapshots.