Re: [Xen-users] how to begin with xen

[Randy Katz <rkatz@xxxxxxxxxxxxxxxxxxxxx>]

ok, does using Sparse file take a performance hit?
or is that the way many do in a production environment?

On 2/18/2011 9:30 PM, Fajar A. Nugraha wrote:
> On Sat, Feb 19, 2011 at 11:20 AM, Randy Katz
> <rkatz@xxxxxxxxxxxxxxxxxxxxx>  wrote:
> > So what's to stop me from using the same IP address twice (by accident)?
> By default? Nothing. Just like nothing will stop you from assigning
> the same IP address twice on two physical servers on the same network.
>
> > Or will it catch that?
> At this point I suggest you take a step back. Think of dom0 like a
> switch. Then think of domUs like any physical server on the same
> network connected to that switch. Anything you usually do with pysical
> servers and switches should apply here as well. Does this make sense
> so far?
>
> Having said that, on some physical switches/routers and servers there
> is a way to restrict certain MAC or IP address to a certain physical
> port. A similar thing can be applied on Xen, but it's somewhat
> complicated. Search in the list archive if you still want to know how.
>
>
> > Also, is there a way to use dynamically configurable storage
> > space?
> > Please explain, thanks.
> Define "dynamically configurable storage":
> - if you mean "I want to change the size of disk presented to domU
> while it's running without having to restart domU", then AFAIK there
> is no easy way to do that yet.
> - if you mean "I want to allow domU to use at most 10G disk space, but
> I don't want to reserve all that space immediately", then the easiest
> way is to use sparse file as domU storage, and use it in domU config
> file with tap:aio. For example on how to create sparse file, see
> http://en.wikipedia.org/wiki/Sparse_file. virt-install also have an
> option to create sparse file (see "man virt-install"), and there
> should be an equivalent place to select in on virt-manager.

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