On Sat, Mar 17, 2012 at 01:01:00PM +0100, Helmut Hullen wrote: > Hallo, linux-btrfs, > > I've (once more) created my test system: > > mkfs.btrfs -d raid0 -m raid1 /dev/sdb1 /dev/sdc1 > > 73 GB + 146 GB. > > Then I mounted it and copied about 150 GByte onto it. But copying was > incomplete, the job ended with "no space on ..." > > > # btrfs fi show > > Label: 'Scsi' uuid: e30586e9-a903-4d17-8ec0-1781457212c6 > Total devices 2 FS bytes used 134.86GB > devid 1 size 68.37GB used 68.37GB path /dev/sdb1 > devid 2 size 136.73GB used 68.35GB path /dev/sdc1 > > Btrfs Btrfs v0.19 > > # btrfs fi df <mountpoint> > > Data, RAID0: total=134.68GB, used=134.67GB > Data: total=8.00MB, used=8.00MB > System, RAID1: total=8.00MB, used=16.00KB > System: total=4.00MB, used=0.00 > Metadata, RAID1: total=1.00GB, used=185.39MB > Metadata: total=8.00MB, used=0.00 > > # df <mountpoint> > > Filesystem 1K-blocks Used Available Use% Mounted on > /dev/sdc1 215059324 141597364 8724 100% /mnt/btr > > # fdisk -l > > Disk /dev/sdb: 73.4 GB, 73407868928 bytes > Disk /dev/sdc: 146.8 GB, 146814976000 bytes > > ----------------------------------- > > Where is the problem, how can I use the full space?
You can't. btrfs requires RAID-0 to be at least two devices wide (otherwise it's not striped at all, which is the point of RAID-0). If you want to use the full capacity of both disks and don't care about the performance gain from striping, use -d single (which is the default). If you do care about the performance gain from striping, then you're going to have to lose some usable space. Hugo. -- === Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk === PGP key: 515C238D from wwwkeys.eu.pgp.net or http://www.carfax.org.uk --- I am but mad north-north-west: when the wind is southerly, I --- know a hawk from a handsaw.
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