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Re: [Xen-users] Mysterious Server Lockups

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Subject: Re: [Xen-users] Mysterious Server Lockups
From: James Pifer <jep@xxxxxxxxxxxxxxxx>
Date: Fri, 13 Feb 2009 09:50:03 -0500
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On Fri, 2009-02-13 at 08:42 -0600, Nick Anderson wrote:
> So over the past month or two one of my Xen boxes has been mysteriously
> locking up. I have found nothing in any of my logs. I setup netconsole
> on dom0 and I don't see any problem msgs on my remote logger (I do see
> kernel msgs like modprobe etc ...).
> I cannot correlate anything with the lockups (no increased traffic or
> anything out of the norm. The lockups do seem to be getting more
> frequent. The first one was several months ago. Then it was a month or
> so later, then three weeks, then 2 weeks (last sat), then yesterday.
> Yesterday I did notice one thing in my sysstat logs on a domU. My
> steal went from >1 (well normally 0) to 5% just before the lockup. But 
> that was just in a single vm. 
> Here is the snippet. 
> 11:35:02 PM       CPU     %user     %nice   %system   %iowait   %steal     
> %idle
> 11:35:01 AM       all      8.70      0.00      3.88      0.14     0.00     
> 87.27
> 11:45:01 AM       all      4.81      0.00      2.35      0.06     5.74     
> 87.03
> For some reason the reboot cleared my sysstat logs for that day prior
> to the reboot time in dom0 so I cannot reference against that.
> Server Specs:
> Supermicro H8DM8-2
> 16GB memory
> 2 x Quad-Core AMD Opteron(tm) Processor 2350
> 3ware 9650LE 8 drive raid 6
> I have 3 domus running.
> The domUs are lvm backed.
> 1 domU has 2 vcpus, the others have a single vcpu.
> Dom0 and domUs are both running debian etch. I am running Xen 3.0.3
> from the repository.
> Any ideas?
> I am considering upgrading to xen 3.2 from backports, but I dont want
> to introduce another variable unless there is a high probability
> upgrading will take care of the issue.


My setup VERY different than yours, but I had similar unexplained
outages. Not sure I can even call it a lockup, because I could still
ping dom0, but it's screen was blank, and the domU's were hosed. 

This was when I was running xen 3.0.x on sles10sp1. I've updated all my
servers to sles10sp2 running xen 3.2.x and for a couple months now I
have not had the problem. 

Way too many difference to make a direct comparison, but...


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