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

[Ady Deac <ady@xxxxxxxxxxx>]

Hi Jan,

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!

Jan Bakuwel wrote:
> Hi,
>
> I'm running Debian Lenny (2.6.26-1-xen-amd64) dom0 thats running 5
> Debian Lenny 2.6.26-1-xen-amd64 domU's. The two busiest of those VMs
> (webservers) frequently hang (every few days); the other three VMs have
> not hung a single time in 122 days (and nor has dom0 obviously). The
> syslogs (of the VMs and dom0) don't show anything useful; I haven't been
> able to correlate the hangs with any event in particular; the hangs seem
> to happen quite randomly (and not necessarily when the VMs are busy).
> All domU's run without swap and sufficient memory (monitor statistics
> show a fair bit of memory allocated to the cache at all times). All VMs
> and dom0 share a single Internet connection and all run their own
> specific firewall.
>
> When a VM hangs, xentop actually thinks its running (its state = r and
> its using nearly 100% CPU). Its not possible to connect to the VM via
> the network (not even ping it), nor is it possible to connect the
> console (console just hangs).
>
> I appreciate any hints, suggestions, etc how I can further diagnose this
> problem.
>
> thanks,
> Jan
>
>
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>   
--
Deac Mihai-Adrian

W: www.mikesoftware.com
P: +40-745-256.364


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