Errors because no free space on / ? [BTRFS]

Hi,
Two weeks ago I reinstalled my pc from scratch. Systemd all the way. The pc doubles as a desktop pc and mediaserver, and everything worked as planned.
Yesterday I installed mkvtoolnix and used it to strip some audio channels from a .mkv. After that, I used packer (AUR installer) to install the faenza and faience icon set. The faenza icon set installed correctly, but the faience icon set did not install because the downloaded package could not be expanded.
This could have two causes:
1. There is no space left on the device.
2. The device is mounted without write-privileges.
I checked both:
1. with 'df -h' -> I have at least 2GB free on every partitition (NOTE: there is my 'media'-partition that is listed as 100% used, but it has 6GB out of 996GB free...)
2. with 'mount -a -o rw' -> /etc/mtab shows that all are mounted rw
This didn't help: pacman refused to install complaining it could not write any file inside the package
I rebooted to make sure it's not a problem with a temporary folder that had been flooded, and now gnome-session refuses to start. X starts, but Gnome/gdm gives me the sad faced computer that something has gone wrong. I can work in the console and checking both hypotheses results in the same conclusion: I have plenty space left and the (relevant) partitions are all mounted 'rw'.
Help?
/EDIT: more info:
* My rootfs is btrfs and systemd warns me that there is no fsck.btrfs, but also that I can safely ignore that warning
* gnome-session complains about I/O-errors when writing to /usr/share
* My SSD is 1.5 years old and I have never had problems before.
Last edited by zenlord (2012-09-27 08:00:41)

zenlord wrote:
Hi,
Two weeks ago I reinstalled my pc from scratch. Systemd all the way. The pc doubles as a desktop pc and mediaserver, and everything worked as planned.
Yesterday I installed mkvtoolnix and used it to strip some audio channels from a .mkv. After that, I used packer (AUR installer) to install the faenza and faience icon set. The faenza icon set installed correctly, but the faience icon set did not install because the downloaded package could not be expanded.
This could have two causes:
1. There is no space left on the device.
2. The device is mounted without write-privileges.
I checked both:
1. with 'df -h' -> I have at least 2GB free on every partitition (NOTE: there is my 'media'-partition that is listed as 100% used, but it has 6GB out of 996GB free...)
2. with 'mount -a -o rw' -> /etc/mtab shows that all are mounted rw
This didn't help: pacman refused to install complaining it could not write any file inside the package
I rebooted to make sure it's not a problem with a temporary folder that had been flooded, and now gnome-session refuses to start. X starts, but Gnome/gdm gives me the sad faced computer that something has gone wrong. I can work in the console and checking both hypotheses results in the same conclusion: I have plenty space left and the (relevant) partitions are all mounted 'rw'.
Help?
/EDIT: more info:
* My rootfs is btrfs and systemd warns me that there is no fsck.btrfs, but also that I can safely ignore that warning
* gnome-session complains about I/O-errors when writing to /usr/share
* My SSD is 1.5 years old and I have never had problems before.
Hi, it's because the metadata in btrfs takes up all of your 2GB.
Btrfs is claimed to be clever enough to allocate inodes dynamically but actually it's not the case.
Try to run 
btrfs filesystem balance /
Btrfs is far from stable. Today I just encountered another strange problem of btrfs. I can't delete an empty directory even with
rm -rf foo
Last edited by qiuwei (2012-10-24 22:10:42)

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