Re: size 2.73TiB used 240.97GiB after balance

[Hendrik Friedel <hendrik@friedels.name>]

Hello,

oh dear, I fear I am in trouble:
recovery-mounted, I tried to save some data, but the system hung.
So I re-booted and sdc is now physically disconnected.

Label: none  uuid: b4a6cce6-dc9c-4a13-80a4-ed6bc5b40bb8
         Total devices 3 FS bytes used 4.67TiB
         devid    1 size 2.73TiB used 2.67TiB path /dev/sdc
         devid    2 size 2.73TiB used 2.67TiB path /dev/sdb
         *** Some devices missing

I try to mount the rest again:
mount -o recovery,ro /dev/sdb /mnt/__Complete_Disk
mount: wrong fs type, bad option, bad superblock on /dev/sdb,
        missing codepage or helper program, or other error
        In some cases useful info is found in syslog - try
        dmesg | tail  or so

root@homeserver:~# dmesg | tail 

[  447.059275] BTRFS info (device sdc): enabling auto recovery
[  447.059280] BTRFS info (device sdc): disk space caching is enabled
[  447.086844] BTRFS: failed to read chunk tree on sdc
[  447.110588] BTRFS: open_ctree failed
[  474.496778] BTRFS info (device sdc): enabling auto recovery
[  474.496781] BTRFS info (device sdc): disk space caching is enabled
[  474.519005] BTRFS: failed to read chunk tree on sdc
[  474.540627] BTRFS: open_ctree failed


mount -o degraded,ro /dev/sdb /mnt/__Complete_Disk
Does work now though.

So, how can I remove the reference to the failed disk and check the data 
for consistency (scrub I suppose, but is it safe?)?

Regards,
Hendrik



On 06.07.2015 22:52, Omar Sandoval wrote:
> On 07/06/2015 01:01 PM, Donald Pearson wrote:
>> Based on my experience Hugo's advice is critical, get the bad drive
>> out of the pool when in raid56 and do not try to replace or delete it
>> while it's still attached and recognized.
>>
>> If you add a new device, mount degraded and rebalance.  If you don't,
>> mount degraded then device delete missing.
>>
>
> Watch out, replacing a missing device in RAID 5/6 currently doesn't work
> and will cause a kernel BUG(). See my patch series here:
> http://www.spinics.net/lists/linux-btrfs/msg44874.html
>


-- 
Hendrik Friedel
Auf dem Brink 12
28844 Weyhe
Tel. 04203 8394854
Mobil 0178 1874363

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