Hallo, linux-btrfs,
First I create an array of 2 disks with
mkfs.btrfs -d raid0 -m raid1 /dev/sdb1 /dev/sdd1
and mount it at /srv/MM.
Then I fill it with about 1,6 TByte.
And then I add /dev/sde1 via
btrfs device add /dev/sde1 /srv/MM
btrfs filesystem balance /srv/MM
(it run about 20 hours)
Then I work on it, copy some new files, delete some old files - all
works well. Only
df /srv/MM
btrfs filesystem df /srv/MM
show some completely wrong values:
# df /srv/MM
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/sdd1 5846053400 1593436456 2898463184 36% /srv/MM
# btrfs filesystem df /srv/MM
Data, RAID0: total=1.67TB, used=1.48TB
System, RAID1: total=16.00MB, used=112.00KB
System: total=4.00MB, used=0.00
Metadata, RAID1: total=3.75GB, used=2.26GB
# btrfs-show
Label: MMedia uuid: 120b036a-883f-46aa-bd9a-cb6a1897c8d2
Total devices 3 FS bytes used 1.48TB
devid 3 size 1.81TB used 573.76GB path /dev/sdb1
devid 2 size 1.81TB used 573.77GB path /dev/sde1
devid 1 size 1.82TB used 570.01GB path /dev/sdd1
Btrfs Btrfs v0.19
------------------------------------------------
"df" shows an "Available" value which isn't related to any real value.
The sum of "used" and "Available" is far away from the really existent
disk space. When I copy additional files to "/srv/MM" then "used" still
shows the right value, and the sum grows (slowly) to the max. available
space.
In "btrfs filesystem df /srv/MM" the line
Data, RAID0: total=1.67TB, used=1.48TB
shows a "total" value which isn't related to any existent value; maybe
it still shows the used space before adding the third partition.
This (wrong) value seems not to change.
Kernel 2.6.38.1
btrfs from november 2010
Viele Gruesse!
Helmut
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