Re: BTRFS raid6 unmountable after a couple of days of usage.

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

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On 2015-07-15 17:29, Chris Murphy wrote:
> On Wed, Jul 15, 2015 at 10:15 AM, Hugo Mills <hugo@carfax.org.uk> wrote:
>
>>     There is at least one superblock on every device, usually two, and
>> often three. Each superblock contains the virtual address of the roots
>> of the root tree, the chunk tree and the log tree. Those are useless
>> without having the chunk tree, so there's also some information about
>> the chunk tree appended to the end of each superblock to bootstrap the
>> virtual address space lookup.
>
> So maybe Austin can use btrfs-show-super -a on every device and see if
> there's anything different on some of the devices, that shouldn't be
> different? There must be something the kernel is tripping over that
> the use space tools aren't for some reason.
>
>
>
>
I actually did do so when this happened most recently (I just didn't 
think to mention it in the most recent e-mail), and nothing appeared to 
be different either between devices or within a given device (IIRC, 
there's 2 sb per device in each of the filesystems in question).

I'm going to try and reproduce this in a VM for inspection as all the 
filesystems I had this issue with now seem to be working fine (with the 
exception of some errors in the data blocks of one that got caught by 
scrub).


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