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List:       xen-users
Subject:    Re: [Xen-users] Debugging (possible) Xen-related hang-issues without the possibility of attaching se
From:       Heiko Wundram <modelnine () modelnine ! org>
Date:       2012-03-28 14:56:55
Message-ID: 08ac799cf4043e3a63875e2516a3f08a () modelnine ! org
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Am 28.03.2012 16:46, schrieb Miles Fidelman:
> 1. Have you thought of installing an IPMI card into your box (if
> available), or hooking up a serial-over-IP box like this one -
> 
> http://www.lantronix.com/device-networking/external-device-servers/eds1100_eds2100.html
> - I've found remote access to a serial port to be invaluable.

I tried to do the latter, but alas, that's not possible due to the 
restrictions the datacenter imposes on user-hardware being deployed in 
their housing-facility. There's not much I can really do against that 
(except switch data-centers, which is somewhere down the road...); the 
replica-hardware I've tested locally (which is similar and for which I 
can access the serial console) does not crash (or at least I can't get 
it to crash using the test-workloads I throw at it, which should be 
similar to the workloads on the deployed system).

> 2. I used to have a really bad crash/hang/reboot issue with my xen
> installation.  It turned out that the solution was to pin VMs to CPUs
> - otherwise there was an intermittent scheduling conflict that would
> simply come up once in a while and crash things.  Never could 
> actually
> find trace of it in logs, but pinning CPUs eliminated the issue.  Not
> sure if that problem has been solved in later releases.

That's interesting, and something that I'll gladly give a try. Thanks 
for the hint!

-- 
--- Heiko.

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