Re: destroyed disk in btrfs raid

[laie <laie@halifax.rwth-aachen.de>]

On 2014-05-11 16:19, Hugo Mills wrote:
> On Tue, May 13, 2014 at 10:16:59AM +0200, laie wrote:
>> On 2014-05-09 20:01, Hugo Mills wrote:
>> >On Fri, May 09, 2014 at 06:58:27PM +0100, Hugo Mills wrote:
>> >>On Fri, May 09, 2014 at 08:02:45PM +0200, laie wrote:
>> >>> Now I'm looking for a way to tell btrfs to provide me with a list of the
>> >>> corrupted files and delete them afterwards. This would be great, because
>> >>> otherwise it would take very long to get the data back from slow backups.
>> >>
>> >>   Simple solution: cat every file to /dev/null, and see which ones
>> >>fail with an I/O error. With RAID-0 data, losing a device is going to
>> >>damage most files, though, so don't necessarily expect much to survive.

I finished building the List, about 40% of the Data is gone. So far so 
good.

As next step I planned to delete these files. This is not possible 
because I'm not able to mount the fs r/w.

btrfs: allowing degraded mounts
btrfs: bdev /dev/mapper/luks-0 errs: wr 37519, rd 32783, flush 0, 
corrupt 0, gen 0
Btrfs: too many missing devices, writeable mount is not allowed
btrfs: open_ctree failed

Is it correct remove the missing device now:

btrfs device delete missing /mnt

Or do I have to add the replacement first?