Re: [Xen-users] Xen 4.0 feature request

[Enrico Valsecchi <admin@xxxxxxxxxx>]

Eljas,
if you have a very large filesystem (some TB) and use a clustered 
filesystem (ex: lustre),
for performance reason isn't a good solution work with LVM....
....and, if you want save only one virtual machine, you can't use a LVM 
snapshot technology!
I think that xen must have a tools that allow create a consistent 
snapshot, because
are a unique possibility to have this features in any environment.

O.K., I mean that this are required only in a enterprise environment but,
if XEN want are a very powerfull vmware alternative, I think that some 
tools are indispensable!
Bye,

Enrico

> If you want snapshots of the filesystem, use LVM. "xm save" takes 
> snapshot of the domain's state (memory and such).
> One secnario where xm save is useful: You need to reboot the Dom0, but 
> want to restore DomUs back to how they were after reboot (really 
> useful when your router is in DomU. Reboot is normally fast enough to 
> get the router back up before the connections timeout).
> -Eljas Alakulppi
>
> On Sun, 05 Jul 2009 17:35:54 +0300, Enrico Valsecchi 
> <admin@xxxxxxxxxx> wrote:
> > > Do you know "xm save"?
> > >
> > > Overmind # xm save
> > > Error: 'xm save' requires between 2 and 3 arguments.
> > >
> > > Usage: xm save [-c] <Domain> <CheckpointFile>
> > >
> > > Save a domain state to restore later.
> > >   -c, --checkpoint               Leave domain running after creating
> > Yes,
> > I know xm save command....
> > ....but:
> >
> > I have make a snapshot with xm save -c, then I have delete some file 
> > in a
> > system
> > (complete remove /boot directory)
> > O.K., I'm shutdown domain and restore.
> >
> > Result are that domain start, but does not are file deleted from me!
> >
> > My little and stupid question are:
> >
> > What do you do with this snapshot???????
> >
> > Bye,
> >
> > Enrico
> >
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