Hi,
I still haven''t seen a single error but this issue is occurring about
once
every 3 weeks or so on one of our hypervisors.
This started happening just this year. We are running Debian Squeeze with
all the latest packages as of about 2 months ago. I added a second core to
our dom0''s and set it to float. They have also been completely patched
this year for the time jump fix. A week or two ago I pinned the second
core, so if it has something to do with multiple dom0 cores the only thing
I have left is to remote the second core and reboot everything. We have
also started using pvgrub more heavily although I would think the guest
shouldn''t be able to prevent the dom0 from destroying the blkback
device/process.
Is anybody else seeing/seen this issue?
-Greg
On Sat, Apr 13, 2013 at 4:56 AM, Tom Fritz <tfritz@novia.net> wrote:
> Greg,
>
>
> We have had a few occasions in the past few months where a VPS will need
>> a hard reboot. After the
>> command "xm shutdown" the VM would no longer boot. I have
traced this to
>> the device mapper device
>> having an open count of 1, and then to the fact that there is a blkback
>> process running for a domain
>> that doesn''t exist. I''m going to go out on a limb
and suggest the
>> blkback device was for the VM in
>> question. I can''t tell if this is a symptom or cause(the
trouble with
>> the blkback process) however I
>> don''t know of any way to close out that backend process
without a reboot
>> so it renders the LV
>> unusable:/ Has anybody witnessed this behavior?
>>
>
>
> Yes I have seen this a number of times om our production machines.
> It will render the machine unable to start/restart a VM. I have not been
> able to find a solution to the issue. If you figure something out I would
> be very interested in hearing about it.
>
> Tom.
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>
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