Re: rw-mount-problem after raid1-failure

[Duncan <1i5t5.duncan@cox.net>]

Anand Jain posted on Wed, 10 Jun 2015 09:19:37 +0800 as excerpted:

> On 06/09/2015 01:10 AM, Martin wrote:
>> Hello!
>>
>> I have a raid1-btrfs-system (Kernel 3.19.0-18-generic, Ubuntu Vivid
>> Vervet, btrfs-tools 3.17-1.1). One disk failed some days ago. I could
>> remount the remaining one with "-o degraded". After one day and some
>> write-operations (with no errrors) I had to reboot the system. And now
>> I can not mount "rw" anymore, only "-o degraded,ro" is possible.
>>
>> In the kernel log I found BTRFS: too many missing devices, writeable
>> mount is not allowed.
>>
>> I read about https://bugzilla.kernel.org/show_bug.cgi?id=60594 but I
>> did no conversion to a single drive.
>>
>> How can I mount the disk "rw" to remove the "missing" drive and add a
>> new one?
>> Because there are many snapshots of the filesystem, copying the system
>> would be only the last alternative ;-)
> 
> How many disks you had in the RAID1. How many are failed ?

The answer is (a bit indirectly) in what you quoted.  Repeating:

>> One disk failed[.] I could remount the remaining one[.]

So it was a two-device raid1, one failed device, one remaining, unfailed.

-- 
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"Every nonfree program has a lord, a master --
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