Re: [Xen-users] Cloning domUs

[Geoff Kirk <geoff.k@xxxxxxxxxxxxxxxxxxx>]

Its a question i've wondered myself. I happened to bump into this link 
earlier today.
http://www.linuxtopia.org/online_books/linux_virtualization/xen_3.0_user_guide/linux_virualization_xen_user_44.html

If i'm reading it correctly it might not be good idea to use too many 
snaphots like that which is kind of what i expected. Thought i'd share 
the link.
Geoff.

Artur Linhart - Linux communication wrote:
> If LVM are used, what are Your opinions about the way simply to create the
> snapshot volume to existing DomU and modify the configuration files on the
> new volume only?
>
> I tried it and it works OK, as far as I tested it till now... The advantage
> is, You can save a lot of disk space because the data are shared by both
> logical volumes till not modified... Also the snapshot creation takes1
> second, so it is much more faster than copy the whole partition... Sure, for
> swap I created brand new volumes, there is no reason to share the data.
>
> Has this way some performance problems?
>
>         With best regards,
>
>                 Archie
>
> -----Original Message-----
> From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
> [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Nico
> Kadel-Garcia
> Sent: Tuesday, August 07, 2007 1:08 AM
> To: Steve Wray
> Cc: Stephen Shaw; Geoff Kirk; xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: Re: [Xen-users] Cloning domUs
>
> Steve Wray wrote:
>   
> > Stephen Shaw wrote:
> >     
> > > > > > > Nico Kadel-Garcia <nkadel@xxxxxxxxx> 08/06/07 1:41 PM >>>           
> > > > > > >               
> > > > Geoff Kirk wrote:
> > > >    
> > > >         
> > > > > shacky wrote:
> > > > >      
> > > > >           
> > > > > > > What storage method are you using for the domU?
> > > > > > >               
> > > > > > >               
> > > > > > I'm using LVM for most domUs...
> > > > > >
> > > > > >
> > > > > >         
> > > > > >             
> > > > > Using LVM i create a new volume  mount the domU i want to copy and 
> > > > > the new volume, format the new volume and cp -dpR the files over, 
> > > > > then edit the network/hostname config. Don't forget swap space too.
> > > > > It maybe you can just snapshot the domU and edit the network but i 
> > > > > don't know if thats wise.
> > > > > Geoff.
> > > > >       
> > > > >           
> > > > I use 'rsync -avH' instead of 'cp -a', since it handles being re-run 
> > > > better and handles exclusions better, too.
> > > >     
> > > >         
> > > rsync is great.  Are you creating sparse files?  If so, can rsync 
> > > handle that
> > > I've used cp --sparse=always when I copy domUs
> > >   
> > >       
> > And don't forget the --numeric-ids on rsync.
> >     
> Not relevant here: the Dom0's /etc/passwd and associated uid's is the 
> one in charge of both the source and target uid's. Very useful for other 
> circumstances, though!
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