Discussion of the installation and of use of Xen.

Omer Khalid | 8 Dec 01:17

Re: LVM & volume groups

Hi,

It depends what do you mean by "all" domU! How many? We have been using single volume group for atleast 3-4 domU's and never had a problem!

Regards
Omer

On 12/7/06, Christopher G. Stach II <cgs <at> ldsys.net> wrote:

Rich Yumul wrote:
> Thanks for your reply - What I really want to know is that if each
> virtual machine should be on it's own volume group, or if it's ok if all
> the domU's share the same volume group? Or does it even make a difference?
>
> Thanks!
>
> Rich

They can share one, but you will want to use CLVM if you don't want to
screw everything up for yourself. This will also soften the blow of
moving to shared storage if/when you get more Xen hosts.

--
Christopher G. Stach II

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Christopher G. Stach II | 8 Dec 04:50

Re: howto create a domU 2.4.18 kernel for xen 3.0.3

Jeremy Caton wrote:
> Hi,
> 
> Does anyone know of a howto or documentation for creating a xen 3.0.3 
> domU for the linux 2.4 kernel (specifically 2.4.18)?  My processor 
> doesn't support full virtualization .... I am a developer and have a 
> legacy app. designed for 2.4.18 that I need to continue supporting for 
> bug fixes etc, but want to transition future development to the 2.6 kernel.
> 
> I would also appreciate a good description/documentation of how to go 
> about patching my 2.4.18 kernel for xen domU (or where I can find a 
> pre-made patch) or how to recompile my 2.4.18 kernel with xen domU support.
> 
> Many thanks in advance,
> -Jeremy

Short answer: you don't.  Use 2.6 or do full virtualization.

--

-- 
Christopher G. Stach II

headers

Nico Kadel-Garcia | 8 Dec 05:31

Re: howto create a domU 2.4.18 kernel for xen 3.0.3

On 12/7/06, John McMonagle <johnm <at> advocap.org> wrote:

Are you shure you need that kernel?

I'm  new to xen but for a test loaded everything from server running
redhat 6.2.
Was running 2.2.22. Xen is running 2.6.18.
It's an old accounting system and want to reuse the hardware.

As I recall I copied everything into a lvm partition.
Fixed  up the fstab.
Changed ip as old server is still up.
Copied in the modules for the xen kernel.
A few error message but do not  think they matter.
Like it complains that /proc is already mounted.
Seems to work fine although my tests were not extensive.

John
___

Old OS images arfe sometimes an adventure. Can you simply remount /proc to clear the complaint?

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lists | 8 Dec 09:55

Windows 2003 HVM Performance

Hello all,

I have recently been trying to install a windows 2003 server on a Xen Dom0 with
an AMD X2 CPU.  I've not actually been able to finish the installation due to
the Dom0 host crashing whilst the Windows installation is "registering
components".  Hopefully the latest version of OpenSUSE (which I'm downloading
at the moment) will fix that? 

During the installation I noticed that the section of the install that copied
files to the harddisc didn't execute very fast which prompted me to google for
xen HVM harddisc performance figures.  I read some references to a windows
paravirtualised harddisc driver that would improve performance.  Does anyone
know whether paravirtualised drivers are in development?  I also read that
network performance is near native so would it make sense to install windows on
a partition on the Dom0 and then create a D drive on the windows machine using
an iSCSI initiator?  This would mean that the domU would be relying on it's
near native network performance for harddisc accesses.  Has anyone tried this?

I'd be interested to hear any advice on settings/tweaks to improve windows HVM
performance.

Many thanks in advance,

Steve.

headers

anant | 8 Dec 10:44

Xen install error: URGENT pls help


Hi all
I installed Fedora core 6 over my fully virtualized system and it was
installed successfully. But now i am trying to install XEN using following
command i.e.
yum install xen kernel-xen0 kernel-xenu 
But i am getting following error:
could not retrieve mirrorlist
http://mirrors.fedoraproject.org/mirrorlist?repo=core-6&arch = i386 error
was
[Errno 4] IOError: <urlopen error (-3,'temperory failure in name
resolution')>
Error: Cannot find a valid base url for repo:core

Please help me out in this problem.And i was also looking for the option to
install XEN along with FC6 but i couldnt find any option . There was one
option to include exta software, i tried that but it created some error and
computer was hanged.
Thanks 

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Pasi Kärkkäinen | 8 Dec 10:48

Re: Windows 2003 HVM Performance

On Fri, Dec 08, 2006 at 08:55:38AM +0000, lists <at> higgers.me.uk wrote:
> Hello all,
> 
> I have recently been trying to install a windows 2003 server on a Xen Dom0 with
> an AMD X2 CPU.  I've not actually been able to finish the installation due to
> the Dom0 host crashing whilst the Windows installation is "registering
> components".  Hopefully the latest version of OpenSUSE (which I'm downloading
> at the moment) will fix that? 
> 
> During the installation I noticed that the section of the install that copied
> files to the harddisc didn't execute very fast which prompted me to google for
> xen HVM harddisc performance figures.  I read some references to a windows
> paravirtualised harddisc driver that would improve performance.  Does anyone
> know whether paravirtualised drivers are in development?  I also read that
> network performance is near native so would it make sense to install windows on
> a partition on the Dom0 and then create a D drive on the windows machine using
> an iSCSI initiator?  This would mean that the domU would be relying on it's
> near native network performance for harddisc accesses.  Has anyone tried this?
> 
> I'd be interested to hear any advice on settings/tweaks to improve windows HVM
> performance.
> 
> Many thanks in advance,
> 

Windows paravirtualized device drivers for disk and network would be a lot
faster, but those are not publicly available :(

They are part of Virtual Iron and Xen Enterprise products only.. :(

-- Pasi

headers

PAINCHAUD Christophe | 8 Dec 10:48

RE: Xen install error: URGENT pls help

What about fixing your yum.conf / network first? Your errors aren't related to xen.

Christophe Painchaud

-----Message d'origine-----
De : xen-users-bounces <at> lists.xensource.com [mailto:xen-users-bounces <at> lists.xensource.com] De la part de anant
Envoyé : Friday, December 08, 2006 10:44 AM
À : xen-users <at> lists.xensource.com
Objet : [Xen-users] Xen install error: URGENT pls help

Hi all
I installed Fedora core 6 over my fully virtualized system and it was
installed successfully. But now i am trying to install XEN using following
command i.e.
yum install xen kernel-xen0 kernel-xenu
But i am getting following error:
could not retrieve mirrorlist
http://mirrors.fedoraproject.org/mirrorlist?repo=core-6&arch = i386 error
was
[Errno 4] IOError: <urlopen error (-3,'temperory failure in name
resolution')>
Error: Cannot find a valid base url for repo:core

Please help me out in this problem.And i was also looking for the option to
install XEN along with FC6 but i couldnt find any option . There was one
option to include exta software, i tried that but it created some error and
computer was hanged.
Thanks

_______________________________________________
Xen-users mailing list
Xen-users <at> lists.xensource.com
http://lists.xensource.com/xen-users

headers

anant | 8 Dec 11:00

RE: Xen install error: URGENT pls help


What about fixing your yum.conf / network first? Your errors aren't related
to xen.

Christophe Painchaud

thanks for replying.
Do you know how to fix that?
I am quite new in linux and xen.
--

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PAINCHAUD Christophe | 8 Dec 11:00

RE: RE: Xen install error: URGENT pls help

Fedora community website and google in general, I am not a FC/RedHat fan, I think you'd better learn a bit more about linux before trying xen.

Regards,

Christophe Painchaud

-----Message d'origine-----
De : xen-users-bounces <at> lists.xensource.com [mailto:xen-users-bounces <at> lists.xensource.com] De la part de anant
Envoyé : Friday, December 08, 2006 11:01 AM
À : xen-users <at> lists.xensource.com
Objet : [Xen-users] RE: Xen install error: URGENT pls help

What about fixing your yum.conf / network first? Your errors aren't related
to xen.

Christophe Painchaud

thanks for replying.
Do you know how to fix that?
I am quite new in linux and xen.
--
View this message in context: http://www.nabble.com/Xen-install-error%3A-URGENT-pls-help-tf2779590.html#a7755210
Sent from the Xen - User mailing list archive at Nabble.com.

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Dominic Hargreaves | 8 Dec 11:48

4GB byte count overflow hangs networking (was Re: domUs dropping off the network (Xen 3.0.2))

On Mon, Dec 04, 2006 at 03:57:10PM +0000, Dominic Hargreaves wrote:
> Hello,
> 
> We've recently started seeing several domUs on multiple machines losing
> all network connectivity. At least one of these machines (since they are
> customer machines I can't verify it for all of them) give the error:
> 
> $ sudo ifup eth0
> eth0: full queue wasn't stopped!

To follow up on this post: the problem happens when the number of bytes
received by the vif on the dom0 side (and therefore transmitted by the
domU) hits 4GB (or within a few kB thereof).

In tests I have verified this against a Xen 3.0.2 system (although it
doesn't always manifest, so perhaps there are other factors in place
too), and have also verified that with Xen 3.0.3 it seems to happen less
often.

Cheers,

Dominic.

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PGP key 5178E2A5 from the.earth.li (keyserver,web,email)

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