Hallo, Goffredo,
Du meintest am 20.01.11:
> To add another disk you don't have to run mkfs.btrfs. For example:
> # add the first disk
> mkfs.btrfs /dev/sdb
> # mount the disk
> mount /dev/sdb /media/backups
> # add another disk to the first one
> btrfs device add /dev/sdc /media/backup
> Note1: the filesystem has to be mounted
> Note2: the medatada will be in raid1, the data in raid0
I've just tried ...
creating /dev/sde with 2 TByte
adding /dev/sdf with 60 GByte (it's easier to check "ENOSPACE" with such
a small device)
copying 94 Gbyte
and then
btrfs filesystem balance /mnt/btr
(needed about 40 minutes for 94 GByte)
leads to
# btrfs filesystem show
Label: none uuid: 121ae2ed-f572-43e6-8855-cd66ad534401
Total devices 2 FS bytes used 94.68GB
devid 2 size 37.27GB used 37.00GB path /dev/sdf
devid 1 size 1.82TB used 63.04GB path /dev/sde
Label: 'MM2' uuid: ad7c0668-316c-4a79-ba00-3b505b9d99b4
Total devices 2 FS bytes used 1.15TB
devid 1 size 1.81TB used 591.14GB path /dev/sde2
*** Some devices missing
Btrfs Btrfs v0.19
# btrfs filesystem df /mnt/btr
Data, RAID0: total=4.00GB, used=2.00GB
Data: total=94.01GB, used=92.58GB
System, DUP: total=8.00MB, used=16.00KB
System: total=4.00MB, used=0.00
Metadata, DUP: total=1.00GB, used=111.87MB
Metadata: total=8.00MB, used=0.00
# df -t btrfs
Filesystem Type 1K-blocks Used Available Use% Mounted on
/dev/sde btrfs 1992597264 99396500 1891304076 5% /mnt/btr
# fdisk -l
# btrfs filesystem show
Label: none uuid: 121ae2ed-f572-43e6-8855-cd66ad534401
Total devices 2 FS bytes used 93.68GB
devid 2 size 37.27GB used 36.12GB path /dev/sdf
devid 1 size 1.82TB used 93.16GB path /dev/sde
Label: 'MM2' uuid: ad7c0668-316c-4a79-ba00-3b505b9d99b4
Total devices 2 FS bytes used 1.15TB
devid 1 size 1.81TB used 591.14GB path /dev/sde2
*** Some devices missing
Btrfs Btrfs v0.19
# btrfs filesystem df /mnt/btr
Data, RAID0: total=64.00GB, used=31.90GB
Data: total=63.01GB, used=61.67GB
System, DUP: total=8.00MB, used=20.00KB
System: total=4.00MB, used=0.00
Metadata, RAID1: total=128.00MB, used=104.71MB
Metadata, DUP: total=1.00GB, used=6.15MB
Metadata: total=8.00MB, used=0.00
# df -t btrfs
Filesystem Type 1K-blocks Used Available Use% Mounted on
/dev/sde btrfs 1992597264 98348716 1892087652 5% /mnt/btr
# -----------------------------------------
Look especially to "btrfs filesystem df /mnt/btr", it shows
Data, RAID0: total=64.00GB, used=31.90GB
Data: total=63.01GB, used=61.67GB
and that will lead to "no space left on device ...".
Viele Gruesse!
Helmut
--
To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
