Re: [Xen-users] io hang with lvm on md raid1

[Glenn Enright <glenn@xxxxxxxxxxxxxxx>]

On 10/10/16 16:06, Sarah Newman wrote:
> On 10/09/2016 02:23 PM, Glenn Enright wrote:
> > Bump? I've now replicated this on raid10 and raid6 as well, so its not caused 
> > by the raid level. An example of a blkback process that is stuck is
> > below, if that offers any additional insight. In all cases I'm seeing dmeventd 
> > stuck first though
> Maybe related? https://bugzilla.kernel.org/show_bug.cgi?id=119841
>
> Xen4CentOS uses 3.18, not 4.4. You could try the Xen4CentOS kernel and see if 
> you get the same errors. Unfortunately EOL for 3.18 is supposed to be
> January 2017.
>
> --Sarah
Thanks for your followup Sarah, I have to admit I was not able to pin 
down the exact cause. We have since implemented a workaround for the issue.
As close as I can determine... for historical reasons related to sparse 
file support we were using cp to copy off an lvm snapshot. Which clearly 
was not tolerant of io problems. We are now using dd with conv=sparse 
and since then have not seen any further recurrences of the lockup.
-- Glenn

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