on Ubuntu 10.10 alpha with btrfs 0.19 and a 2.6.35
(2.6.35-12-generic #17-Ubuntu SMP Mon Jul 26 18:48:06)
I created a btrfs raid 1 system:
# mkfs.btrfs -d raid1 -m raid1 /dev/sdb1 /dev/sdc1
Then I rebooted without disk 3 (/dev/sdc). I was able to mount the btrfs
with mount -o degraded.
However, I was not able to remove the defect device.
# btrfs device delete /dev/sdc1
ERROR: error removing the device '/dev/sdc1'
# dmesg | tail
...
[ 110.524145] btrfs: allowing degraded mounts
[ 439.104487] btrfs: unable to go below two devices on raid1
I was able to add a new device (again /dev/sdc1, but on another disk),
but apparently it was not used as a raid1 device:
# btrfs de add /dev/sdc1 /media/btrfs/
# btrfs fi sh
Label: none uuid: dc691a5d-187e-4cb4-a94a-d12dabdffde4
Total devices 3 FS bytes used 3.76GB
devid 1 size 8.00GB used 5.35GB path /dev/sdb1
devid 3 size 8.00GB used 0.00 path /dev/sdc1
*** Some devices missing
Is there a way to replace a defect raid1 device as with mdadm?
Or is this not yet implemented in btrfs?
Best wishes,
Michael Kofler
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