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Re: [Xen-users] Frequent para (Linux) domU hangs

To: Ady Deac <ady@xxxxxxxxxxx>
Subject: Re: [Xen-users] Frequent para (Linux) domU hangs
From: Jan Bakuwel <jan.bakuwel@xxxxxxxxx>
Date: Mon, 21 Sep 2009 10:59:06 +1200
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Hi Ady,

In my case dom0 and domU are running the same kernel (para virt).

I'm running 2.6.26-1-xen-amd64 while 2.6.26-2-xen-amd64 is available

The reason I haven't upgraded this production server yet is that the
Debian Lenny scripts for Xen combined wit the new grub can seriously
mess up the system boot up sequence (requiring manual repair). The
server is in a remote datacenter... so it potentially not being able to
rebooting is a pain...

How are you using Xen: same kernel for dom0 and domU as well?


Ady Deac wrote:
> Hi Jan,
> Hmmm, this sounds exactly like something that hit me a while ago. This
> has happen right after I've upgraded the dom0 kernel. I needed to
> re-build the domU's kernel with the same sources as dom0's.
> Have phun!
> Jan Bakuwel wrote:
>> Hey Ady,
>>> You should strongly consider adding swap. Running a webserver is like
>>> running on ice. I am building custom servers for quite a long time,
>>> but I never ever considered that a web server has "sufficient" memory.
>>> Maybe only if we are talking about some 200-400GB RAM host? Then you
>>> could assign "sufficient" memory to each of your two web server and
>>> have some for the other 3 VPSs running there.
>>> Adding a 1GB swap file to each of your VPS will show that I'm right.
>>> ;) I always am! :D
>>> Good luck!
>> To swap or not to swap... :-)
>> I did add swap but it didn't have the desired result (i.e. still
>> hanging). Also I'd expect the kernel to start killing processes if it
>> runs out of memory... and not just hang?
>> Jan

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