Re: [Xen-users] Xen + VServer

[Dominique Rousseau <d.rousseau@xxxxxxx>]

Le Fri, Aug 19, 2005 at 11:12:25AM +0200, Dirk H. Schulz
[dirk.schulz@xxxxxxxxxxxxx] a écrit:
> >That's great to hear!  Xen and Vserver are IMHO highly complimentary and 
> >it'd be great to be able to use them together.  The VServer patch (last 
> >time I checked) was very nicely arch independent but I think it's quite a 
> >long time since anybody has tried to run it on Xen - well done!
> >
> What advantage does Vserver have compared to Xen ??? why should it make 
> sense to use both?

Vserver makes it possible to share on-disk and in-memory the footprint
of a given program between separate contexts.
The kernel being shared, if you make your different contexts with
hardlinks "copies" of the files, you can have the same code of libc,
damemons, ... loaded only once in memory, only the "data" part of memory
allocated is charged for each virtual server.
So, you get virtual servers that are very efficient on memory and disk
usage.
On the other hand, you get less control on the allocation/limitation of
ressources used (memory, cpu, ...) and since you have all contexts
running in the same kernel a potential security hole ine the kernel
would be open to every of the virtual servers.


Dom


-- 
Dominique Rousseau 
Neuronnexion, Prestataire Internet & Intranet
57, route de Paris 80000 Amiens
tel: 03 22 71 61 90 - fax: 03 22 71 61 99 - http://www.neuronnexion.fr

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