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

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.


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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