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
Note 3: if the disk has been used (especially under btrfs) you should
first delete old partitioning data etc:
dd if=/dev/zero of=/dev/sdb count=1000
dd if=/dev/zero of=/dev/sdc count=1000
I've just tried your recipe with two devices I had used for other btrfs
experiments:
btrfs filesystem show 2>/dev/null
shows my new wishes, and it shows the old settings too.
But writing 1000 blocks seems to be not enough - sometimes I'll try
bigger numbers. What happens with the old (and now unwanted) settings?
By the way: I nee "2>/dev/null" because the actual git version always
tries to show all block devices which it finds in "/dev" (no: I don't
use "udev").
Viele Gruesse!
Helmut
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