Re: How to stress test raid6 on 122 disk array

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

On 2016-08-15 09:38, Martin wrote:
>> Looking at the kernel log itself, you've got a ton of write errors on
>> /dev/sdap.  I would suggest checking that particular disk with smartctl, and
>> possibly checking the other hardware involved (the storage controller and
>> cabling).
>>
>> I would kind of expect BTRFS to crash with that many write errors regardless
>> of what profile is being used, but we really should get better about
>> reporting errors to user space in a sane way (making people dig through
>> kernel logs to figure out their having issues like this is not particularly
>> user friendly).
>
> Interesting!
>
> Why does it speak of "device sdq" and /dev/sdap ?
>
> [337411.703937] BTRFS error (device sdq): bdev /dev/sdap errs: wr
> 36973, rd 0, flush 1, corrupt 0, gen 0
> [337411.704658] BTRFS warning (device sdq): lost page write due to IO
> error on /dev/sdap
>
> /dev/sdap doesn't exist.
>
I'm not quite certain, something in the kernel might have been confused, 
but it's hard to be sure.