Re: [Xen-users] Xen Setup

["Todd Deshane" <deshantm@xxxxxxxxx>]

On Thu, Aug 7, 2008 at 1:02 AM, Alan <alan@xxxxxxxxxxxxx> wrote:
> 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?
>
>

Yeah, with Intel-VT or AMD-V, running Windows is possible. In Xen terminology,
an unmodified guest is called an HVM guest.

>
> 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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> Xen-users@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-users
>



-- 
Todd Deshane
http://todddeshane.net
check out our book: http://runningxen.com

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