Hallo, Johannes,
Du meintest am 24.01.11:
>> My other problem: where has the ENOSPC problem be cured? Is it a
>> kernel problem?
> Which one? And yes, ENOSPC is kernel related.
The problem:
I create 1 btrfs device with 2 TByte
I add another device with 40 GByte
I fill the btrfs "device" with 30 GByte and then run "balance".
That results in
# btrfs filesystem show
Label: none uuid: 121ae2ed-f572-43e6-8855-cd66ad534401
Total devices 2 FS bytes used 94.68GB
devid 2 size 37.27GB used 37.00GB path /dev/sdf
devid 1 size 1.82TB used 63.04GB path /dev/sde
Label: 'MM2' uuid: ad7c0668-316c-4a79-ba00-3b505b9d99b4
Total devices 2 FS bytes used 1.15TB
devid 1 size 1.81TB used 591.14GB path /dev/sde2
*** Some devices missing
Btrfs Btrfs v0.19
# btrfs filesystem df /mnt/btr
Data, RAID0: total=4.00GB, used=2.00GB
Data: total=94.01GB, used=92.58GB
System, DUP: total=8.00MB, used=16.00KB
System: total=4.00MB, used=0.00
Metadata, DUP: total=1.00GB, used=111.87MB
Metadata: total=8.00MB, used=0.00
# df -t btrfs
Filesystem Type 1K-blocks Used Available Use% Mounted on
/dev/sde btrfs 1992597264 99396500 1891304076 5% /mnt/btr
# fdisk -l
# btrfs filesystem show
Label: none uuid: 121ae2ed-f572-43e6-8855-cd66ad534401
Total devices 2 FS bytes used 93.68GB
devid 2 size 37.27GB used 36.12GB path /dev/sdf
devid 1 size 1.82TB used 93.16GB path /dev/sde
Label: 'MM2' uuid: ad7c0668-316c-4a79-ba00-3b505b9d99b4
Total devices 2 FS bytes used 1.15TB
devid 1 size 1.81TB used 591.14GB path /dev/sde2
*** Some devices missing
Btrfs Btrfs v0.19
# btrfs filesystem df /mnt/btr
Data, RAID0: total=64.00GB, used=31.90GB
Data: total=63.01GB, used=61.67GB
System, DUP: total=8.00MB, used=20.00KB
System: total=4.00MB, used=0.00
Metadata, RAID1: total=128.00MB, used=104.71MB
Metadata, DUP: total=1.00GB, used=6.15MB
Metadata: total=8.00MB, used=0.00
# df -t btrfs
Filesystem Type 1K-blocks Used Available Use% Mounted on
/dev/sde btrfs 1992597264 98348716 1892087652 5% /mnt/btr
# ---------------------------------------------------
Regard the difference between "df" and "btrfs filesystem df".
When I copy some more files then the system tells "no space left on ..."
Yesterday I've run a similar experiment with 40 and 8 GByte - same bad
behaviour:
# btrfs filesystem show
Label: none uuid: da2f178e-a364-4494-a9e5-a7762ed81d10
Total devices 2 FS bytes used 3.83GB
devid 1 size 7.51GB used 6.13GB path /dev/sdb
devid 2 size 37.27GB used 6.13GB path /dev/sdc
Btrfs Btrfs v0.19
# btrfs filesystem df /mnt/btr
Data, RAID0: total=12.00GB, used=3.83GB
System, RAID1: total=8.00MB, used=4.00KB
System: total=4.00MB, used=0.00
Metadata, RAID1: total=128.00MB, used=4.47MB
# df -t btrfs
Dateisystem Typ 1K-Blöcke Benutzt Verfügbar Ben% Eingehängt auf
/dev/sdb btrfs 46963224 4021964 42667804 9% /mnt/btr
Viele Gruesse!
Helmut
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