[gentoo-user] XEN on Gentoo, enough stable for production use ?

[gentoo-user] XEN on Gentoo, enough stable for production use ?

[Xavier MOGHRABI]

Hi guys,

I've learnt months ago the existing of Xen project. I think this kind of 
feature is really interesting for hosting heterogeous application, improve 
security of my system and reduce the maintain effort.

I wonder if any of yours have already experienced Xen on Gentoo ?
I wonder if Xen is enough stable to use in production ?

Thanks in advance for your information.

-- 
Xavier MOGHRABI - Consortium ObjectWeb
Jabber: moghrabi@jabber.objectweb.org - Phone: +33 4 76 61 52 35
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Re: [gentoo-user] XEN on Gentoo, enough stable for production use ?

[Robert Welz]

Xavier MOGHRABI wrote:
> Hi guys,
> 
> I've learnt months ago the existing of Xen project. I think this kind of 
> feature is really interesting for hosting heterogeous application, improve 
> security of my system and reduce the maintain effort.
> 
> I wonder if any of yours have already experienced Xen on Gentoo ?
> I wonder if Xen is enough stable to use in production ?
> 
> Thanks in advance for your information.
> 
Hi.
I use XEN (latest) without migration and have no big problems so far. 
The only big problem I had was to set up the network addresses of the 
domU's to their own subnet and to have dom0 routing instead of bridging. 
But that was to solve mainly with some websites which describes that 
task. And I disabled tx checksumming on the network interfaces in each 
domU to make the network go but this was discussed on the xen mailing list.

My network speed from one xenized machine to another xenized machine is 
asymetric ( 30 MByte/s vs. 15 MByte/s (roughly) from DOM0 to DOM0, 
depending on the direction, measured with iperf ) on GB Ethernet but I 
believe that my hardware is the bottleneck, not XEN. I will further 
investigate the problem when I have some spare time.


Robert

BTW. I didn't use genkernel, I configured the kernel by hand.
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Re: [gentoo-user] XEN on Gentoo, enough stable for production use ?

[Robert Welz]

I have some problems with NFS on a domU. Having mounted my home 
partition on Dom0 from an nfs server on a domU I invoke an X-Session and 
get my e-mail from my server from another DomU with thunderbird. I get 
some 1000 mails a day. Sometimes suddenly all hangs and 
/var/log/messages tell me "NFS server cannot be contacted".

I can ping to the outside but I cannot ping each of my DomU's.

My second xenified machine doesn't crash and runs several days now. but 
has neither an nfs server nor an X-server installed.

I filed a bug today and do not mount my home partition from the nfs 
server anymore although every 2nd day a script connects to all my 
domains over ssh and does an emerge -update -deep world [+metadata] 
after --sync on the portage proxy over nfs, which is apparently the same 
nfs server my home partion came from. I will investigate that further 
and report if I still have problems.

Greetings,
Robert


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