[Carpenter]

(14th Dec, 2013 09:27 PM)mk01 Wrote:  

(14th Dec, 2013 09:09 PM)Carpenter Wrote:  \

Terminal

root@xbian:~# df -h
Filesystem Size Used Avail Use% Mounted on
rootfs 3.5G 2.0G 1.5G 59% /
/dev/mmcblk0p2 3.5G 2.0G 1.5G 59% /
devtmpfs 125M 4.0K 125M 1% /dev
none 25M 2.3M 23M 9% /run
/dev/mmcblk0p1 34M 20M 15M 57% /boot
/dev/mmcblk0p2 3.5G 2.0G 1.5G 59% /home
/dev/mmcblk0p2 3.5G 2.0G 1.5G 59% /lib/modules

can you provide ssh for remote access?? I would be interested in that one case as it was reported few times but I could never "check" it myself.

what "btrfs fi df /" is saying ?

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@Carpenter

copied text from https://btrfs.wiki.kernel.org/index.php/Problem_FAQ#I_get_.22No_space_left_on_device.22_errors.2C_but_df_says_I.27ve_got​_lots_of_space

Quote:I get "No space left on device" errors, but df says I've got lots of space

First, check how much space has been allocated on your filesystem:

Code:

$ sudo btrfs fi show
Label: 'media'  uuid: 3993e50e-a926-48a4-867f-36b53d924c35
    Total devices 1 FS bytes used 61.61GB
    devid    1 size 133.04GB used 133.04GB path /dev/sdf

Note that in this case, all of the devices (the only device) in the filesystem are fully utilised. This is your first clue.
Next, check how much of your metadata allocation has been used up:

Code:

$ sudo btrfs fi df /mount/point
Data: total=127.01GB, used=56.97GB
System, DUP: total=8.00MB, used=20.00KB
System: total=4.00MB, used=0.00
Metadata, DUP: total=3.00GB, used=2.32GB
Metadata: total=8.00MB, used=0.00

Note that the Metadata used value is fairly close (75% or more) to the Metadata total value, but there's lots of Data space left. What has happened is that the filesystem has allocated all of the available space to either data or metadata, and then one of those has filled up (usually, it's the metadata space that does this). For now, a workaround is to run a partial balance:

Code:

$ sudo btrfs fi balance start -dusage=5 /mount/point

Note that there should be no space between the -d and the usage. This command will attempt to relocate data in empty or near-empty data chunks, allowing the space to be reclaimed and reassigned to metadata. More information is available elsewhere in this wiki, if you want to know what a balance does, or what options are available for the balance command.

@mk01: will send you the login details.

btrfs fi df /

Terminal

root@xbian:/tmp/btrfs-snap# btrfs fi df /
Data: total=3.08GB, used=1.66GB
System: total=4.00MB, used=16.00KB
Metadata: total=392.00MB, used=343.58MB

sudo btrfs fi show

Terminal

root@xbian:/tmp/btrfs-snap# sudo btrfs fi show
Label: 'xbian-beta2' uuid: 67901a92-640f-4087-96b2-7719a8367476
Total devices 1 FS bytes used 2.00GB
devid 1 size 3.46GB used 3.46GB path /dev/mmcblk0p2

Btrfs v0.20-rc1-358-g194aa4a

sudo btrfs fi balance start -dusage=5 /mount/point

Terminal

root@xbian:/tmp/btrfs-snap# sudo btrfs fi df /mount/point
ERROR: can't access to '/mount/point'