Re: btrfs dev sta not updating

[Nikolay Borisov <nborisov@suse.com>]

On 23.06.20 г. 12:48 ч., Russell Coker wrote:
> On Tuesday, 23 June 2020 6:17:00 PM AEST Nikolay Borisov wrote:
>>> In this case I'm getting application IO errors and lost data, so if the
>>> error count is designed to not count recovered errors then it's still not
>>> doing the right thing.
>>
>> In this case yes, however this was utterly not clear from your initial
>> email. In fact it seems you have omitted quite a lot of information. So
>> let's step back and start afresh. So first give information about your
>> current btrfs setup by giving the output of:
>>
>> btrfs fi usage /path/to/btrfs
> 
> # btrfs fi usa .
> Overall:
>     Device size:                  62.50GiB
>     Device allocated:             19.02GiB
>     Device unallocated:           43.48GiB
>     Device missing:                  0.00B
>     Used:                         16.26GiB
>     Free (estimated):             44.25GiB      (min: 22.51GiB)
>     Data ratio:                       1.00
>     Metadata ratio:                   2.00
>     Global reserve:               17.06MiB      (used: 0.00B)
> 
> Data,single: Size:17.01GiB, Used:16.23GiB (95.43%)
>    /dev/sdc1      17.01GiB
> 
> Metadata,DUP: Size:1.00GiB, Used:17.19MiB (1.68%)
>    /dev/sdc1       2.00GiB
> 
> System,DUP: Size:8.00MiB, Used:16.00KiB (0.20%)
>    /dev/sdc1      16.00MiB
> 
> Unallocated:
>    /dev/sdc1      43.48GiB

Do you use compression on this filesystem i.e have you mounted with
-ocompression= option ?

Based on this data alone it's evident that you don't really have mirrors
of the data, in this case having experienced the checksum errors should
have indeed resulted in error counters being incremented. I'll look into
this.

<snip>