Re: No space on empty, degraded raid10

[Austin S Hemmelgarn <ahferroin7@gmail.com>]

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On 2014-09-11 07:38, Hugo Mills wrote:
> On Thu, Sep 11, 2014 at 07:19:00AM -0400, Austin S Hemmelgarn wrote:
>> On 2014-09-11 02:40, Russell Coker wrote:
>>> Also it would be nice if there was a N-way mirror option for system data.  As 
>>> such data is tiny (32MB on the 120G filesystem in my workstation) the space 
>>> used by having a copy on every disk in the array shouldn't matter.
>>
>> N-way mirroring is in the queue for after RAID5/6 work; ideally, once it
>> is ready, mkfs should default to one copy per disk in the filesystem.
> 
>    Why change the default from 2-copies, which it's been for years?

Sorry about the ambiguity in my statement, I meant that the default for
system chunks should be one copy per disk in the filesystem.  If you
don't have a copy of the system chunks, then you essentially don't have
a filesystem, and that means that BTRFS RAID6 can't provide true
resilience against 2 disks failing catastrophically unless there are at
least 3 copies of the system chunks.


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