I'm trying to copy a ~220 GB file from a ext4 to btrfs filesystem with
336 GB free space on it. System is running 2.6.36-rc6.
File size on a ext4 filesystem:
# ls -l srv1-backup.qcow2
-rw-r--r-- 1 root root 219564146688 2010-09-26 21:56 srv1-backup.qcow2
Unfortunately it fails when only about 32 GB is copied (with
compress-force mount option enabled).
Copying to btrfs mount point stops, no reads or writes from any
filesystem, after file copied to btrfs is around 32 GB:
$ ls -l /mnt/btrfs/srv1-backup.qcow2
-rw-r--r-- 1 root root 32328482816 2010-10-04 21:49
/mnt/btrfs/srv1-backup.qcow2
This is 100% reproducible, when it gets to ~32 GB (varies by +/- 2 GB),
cp can't be interrupted, killed and the only way to get this "fixed"
seem to be rebooting the machine.
_Sometimes_, cp quits after waiting for longer with "no space left".
To reproduce:
Let's create a btrfs filesystem:
# mkfs.btrfs /dev/sdb4
WARNING! - Btrfs Btrfs v0.19 IS EXPERIMENTAL
WARNING! - see http://btrfs.wiki.kernel.org before using
fs created label (null) on /dev/sdb4
nodesize 4096 leafsize 4096 sectorsize 4096 size 335.72GB
Btrfs Btrfs v0.19
# mount -o noatime,compress-force /dev/sdb4 /mnt/btrfs/
# df -h /mnt/btrfs
Filesystem Size Used Avail Use% Mounted on
/dev/sdb4 336G 56K 336G 1% /mnt/btrfs
# cp -v srv1-backup.qcow2 /mnt/btrfs/
`srv1-backup.qcow2' -> `/mnt/btrfs/srv1-backup.qcow2'
It always hands for me after copying ~32 GB, or quits with "no space left".
--
Tomasz Chmielewski
http://wpkg.org
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