Package: coreutils
Version: 8.13-3.2
Create a RAID1 btrfs from two LVs, each is 1TB:
mkfs.btrfs -m raid1 -d raid1 /dev/mapper/vg00-btrfsvol0_[01]
Mount the filesystem:
mount /dev/mapper/vg00-btrfsvol0_0 /mnt/btrfs0
Now copy 25GB of files onto the volume
Finally, check it with df:
df -lh /mnt/btrfs0
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg00-btrfsvol0_0 1.9T 51G 1.8T 3% /mnt/btrfs0
Notice that:
Size should be 1TB (df report 1.9T)
Used should be 25GB
This seems to be something to do with the way btrfs reports space in a
RAID1 volume. The command `btrfs fi df` shows only 25GB is used.
However, other scripts and applications that rely on the output of df
may fail or behave unexpectedly.
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