[Gluster-users] VM disks corruption on 3.7.11

[Alastair Neil]

I am slightly confused you say you have image file corruption but then you
say the qemu-img check says there is no corruption.  If what you mean is
that you see I/O errors during a heal this is likely to be due to io
starvation, something that is a well know issue.

There is work happening to improve this in version 3.8:

https://bugzilla.redhat.com/show_bug.cgi?id=1269461



On 19 May 2016 at 09:58, Kevin Lemonnier <lemonnierk at ulrar.net> wrote:

> That's a different problem then, I have corruption without removing or
> adding bricks,
> as mentionned. Might be two separate issue
>
>
> On Thu, May 19, 2016 at 11:25:34PM +1000, Lindsay Mathieson wrote:
> >    On 19/05/2016 12:17 AM, Lindsay Mathieson wrote:
> >
> >      One thought - since the VM's are active while the brick is
> >      removed/re-added, could it be the shards that are written while the
> >      brick is added that are the reverse healing shards?
> >
> >    I tested by:
> >
> >    - removing brick 3
> >
> >    - erasing brick 3
> >
> >    - closing down all VM's
> >
> >    - adding new brick 3
> >
> >    - waiting until heal number reached its max and started decreasing
> >
> >      There were no reverse heals
> >
> >    - Started the VM's backup. No real issues there though one showed IO
> >    errors, presumably due to shards being locked as they were healed.
> >
> >    - VM's started ok, no reverse heals were noted and eventually Brick 3
> was
> >    fully healed. The VM's do not appear to be corrupted.
> >
> >    So it would appear the problem is adding a brick while the volume is
> being
> >    written to.
> >
> >    Cheers,
> >
> >  --
> >  Lindsay Mathieson
>
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>
>
> --
> Kevin Lemonnier
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>
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