Hi,
I was trying to remove a 'missing' drive from a raid1 setup. It was
suggested on this list that I update to HEAD. I updated my kernel to
Ubuntu-lts-2.6.37-2.9, which appears to have the latest BTRFS code in it. I
then tried to remove my missing drive again:
r...@willvo:~# btrfs filesystem show
failed to read /dev/sr0
Label: none uuid: f929c413-01c8-443f-b4f2-86f36702f519
Total devices 3 FS bytes used 594.71GB
devid 1 size 931.51GB used 604.00GB path /dev/sdb1
devid 2 size 931.51GB used 604.00GB path /dev/sdc1
*** Some devices missing
Btrfs v0.19-36-gcbc979b-dirty
r...@willvo:~# btrfs device delete missing /data
r...@willvo:~# tail -1 /var/log/syslog
Nov 6 13:36:29 willvo kernel: [ 1227.711276] btrfs: no missing devices found
to remove
r...@willvo:~# btrfs filesystem show
failed to read /dev/sr0
Label: none uuid: f929c413-01c8-443f-b4f2-86f36702f519
Total devices 3 FS bytes used 594.71GB
devid 1 size 931.51GB used 604.00GB path /dev/sdb1
devid 2 size 931.51GB used 604.00GB path /dev/sdc1
*** Some devices missing
Btrfs v0.19-36-gcbc979b-dirty
This is already strange as 'btrfs device delete' cannot find the missing device
that 'btrfs filesystem show' knows about. But then things get really strange...
r...@willvo:~# btrfs filesystem df /data
Data, RAID0: total=1.18TB, used=596.74GB
System: total=4.00MB, used=96.00KB
Metadata, RAID0: total=2.00GB, used=993.35MB
Why is my filesystem suddenly showing RAID0? Note that the used space
displayed still seems to suggest raid 1. Unfortunately I didn't notice the
raid0 label right away, and did:
r...@willvo:~# btrfs filesystem balance /data
r...@willvo:~# btrfs filesystem show
failed to read /dev/sr0
Label: none uuid: f929c413-01c8-443f-b4f2-86f36702f519
Total devices 3 FS bytes used 594.71GB
devid 1 size 931.51GB used 298.88GB path /dev/sdb1
devid 2 size 931.51GB used 298.88GB path /dev/sdc1
*** Some devices missing
Btrfs v0.19-36-gcbc979b-dirty
r...@willvo:~# btrfs filesystem df /data
Data, RAID0: total=596.00GB, used=593.75GB
System: total=4.00MB, used=52.00KB
Metadata, RAID0: total=1.75GB, used=979.95MB
Which seems to have believed the spurious raid0 setting and converted my setup
from raid1 to raid0 - albeit still with missing devices.
Is there any way to 'convert back' to raid1? My reading suggests that feature
isn't implemented yet - although I managed to magically convert from raid1 to
raid0, so who knows.
Cheers,
Will :-}
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