On Jan 24, 2013, at 9:30 PM, Chris Murphy <lists@xxxxxxxxxxxxxxxxx> wrote: > > 2x 80GB virtual disks, mkfs.btrfs -d raid1 -m raid1: > > # df -h > Filesystem Size Used Avail Use% Mounted on > /dev/sdb 160G 56K 158G 1% /mnt Also, copying a 1G file to /mnt, and I end up with: # df -h Filesystem Size Used Avail Use% Mounted on /dev/sdb 160G 2.0G 150G 2% /mnt This is consistent as in raid1 mirror, a 1GB file is effectively duplicated and takes up 2GB of the 160GB volume. The thing I consider a bug, is this: [root@f18v mnt]# btrfs fi df /mnt Data, RAID1: total=4.00GB, used=1000.75MB Because of the RAID1, the amount of chunks allocated for data, raid1 is actually 8GB, and the amount used is actually 2GB. If this volume wasn't a RAID1, copying a 1GB file would give identical results to the above, except the RAID1 wouldn't be there. So we have df being literal, and btrfs fi df itself being secret decoder ringy. Not cool. But I think this is a known area needing improvement. Chris Murphy -- devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxxx https://admin.fedoraproject.org/mailman/listinfo/devel
