Re: Issues while doing btrfs delete missing in raid6

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On Mon, 20 Nov 2017 01:43:44 -0500
Jérôme Carretero <cJ-ko@xxxxxxxxxxx> wrote:

> Hi,
> 
> 
> While doing a test (to evaluate drives), where I'm filling a bunch of
> drives in RAID6, one of the disks failed in the process.
> (System with v4.14 / ECC).
> I remounted the array in degraded, launched a "btrfs delete missing"
> as I have no replacement device.
> 
> The command (takes ages and) fails with:
>  ERROR: error removing device 'missing': Input/output error

> Since this is RAID6, I wasn't expecting to not be able to recover
> from a checksum issue, also it's not very practical to bail out on
> the first error of this kind during a delete... the offending blocks
> could be left as is.

While doing a "tar c /mnt/test | pv >/dev/null" I see the csum errors,
but they are corrected then.
I guess I'll try to scrub and see. But there's probably a bug, if
delete/replace/balance can't do that.


Regards,

-- 
Jérôme

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