RE: [Xen-users] Xen Setup

["Alan" <alan@xxxxxxxxxxxxx>]

Hi Todd,

 

Thanks for your reply, the performance isolation helps – primarily so that one VPS being chewed up won’t affect another too adversely.

 

The ability to run Windows would be good, but not essential. With virtualisation technology support from the CPU – would it be possible to run Windows unmodified?

 

I am not fussed about having to reboot the domU to have the LVM partition size upgrade/downgrade take effect. That is fine, only takes 2-3 minutes at most for it to come back up etc. Online resize isn’t necessary for my application.

 

-Alan

 

-----Original Message-----
From: Todd Deshane [mailto:deshantm@xxxxxxxxx]
Sent: Thursday, 7 August 2008 2:35 PM
To: Alan Lam
Cc: xen-users
Subject: Re: [Xen-users] Xen Setup

 

On Thu, Aug 7, 2008 at 12:22 AM, Alan <alan@xxxxxxxxxxxxx> wrote:

> Hi Todd,

> 

> 

> 

> Thanks for your reply. I am after something that will provide more than just

> a chroot-based environment for the VPS. Virtuozzo/OpenVZ is effectively a

> chroot environment if you look at its filesystem structure.

> 

> 

 

I don't actually know the guts of OpenVZ, but implementing performance isolation

in OS level virtualization (such as openVZ, solaris zones, etc.) has

been notoriously

difficult. In Xen, the situation has been better in general.

 

 

> 

> The CPU will have Virtualisation Technology and 64bit capability which is

> why I am exploring a full virtualisation type of setup rather than a

> chrooted one.

> 

 

So do you plan to make use of unmodified guests, i.e. do you hope to support

Windows or the like?

 

> 

> 

> With a LVM partition setup, I assume I can use the LVM tools to easily

> resize a partition/filesystem to cater for more space/less space needed on a

> certain VPS?

> 

 

Yes, the current state of the art requires rebooting the guest, but

this is likely

not to be the case in a general sense for long. There are probably even really

tricky ways to get online resizing of a file system to work for a guest, but it

is not generally supported yet (that I know of).

 

Also for a general reference on Xen, check out our "Running Xen" book.

 

Cheers,

Todd

 

--

Todd Deshane

http://todddeshane.net

check out our book: http://runningxen.com

 

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