Re: [Xen-users] copy the running image, not working

[Xin Chen <xcheney@xxxxxxxxxxxxxx>]

great! I can write a script like :

# xm save dom-win2k somefile
# cp winsk.img win2k.img.bak
# cp somefile somefile.bak
# xm restore somefile


to run the backup every night.

Thanks a lot ! Mat.

cheers,
chen



Petersson, Mats wrote:

>  
>
> > -----Original Message-----
> > From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx 
> > [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Xin Chen
> > Sent: 31 May 2007 13:01
> > To: xen-users
> > Subject: [Xen-users] copy the running image, not working
> >
> > Hi All,
> >
> > Domain 0 System: Fedora 6,  fc6xen. kernel 2.6.18, because 
> > 2.6.20 seems 
> > not good.
> > Guest system: Fedora 6 and Window 2000 server.
> >
> > I was trying to backup the guest system I created.
> > The guest system is running(windows 2000 server, 
> > full-virtual). I copy 
> > the image like: cp win2k win2k.bak
> > When it is copied, I change win2k.bak to win2k, and try to start the 
> > system using this file, and it stops when starting the windows system.
> > Does that mean we can't copy the image when the system is running, it 
> > seems the system will write the image file every minuters.
> >    
> Yes, there's no guarantee that the filesystem on the disk-image is
> "correct" at any time except when you've told the OS "you need to save
> everything to disk now" - which is usually what happens during a
> "poweroff" or "shutdown" situation, and at no other times. 
>
> There are filesystems that are more resiliant than others, but assuming
> that you don't actually want to change the filesystem (which is
> unlikely, as Windows don't offer much in the way of choice here), you'll
> have to make sure you either shut down the server, or use the method
> described below. 
>  
>
> > In this case, what 's the best way to backup the guest 
> > images. We don't 
> > want to shut down the server everytime when we do the backup, right?
> >    
> The most user friendly way to back things up, in my opinion, is to take
> a snapshot of the guest as it runs and the disk-image with it. So you do
> something like:
>
> # xm save dom-win2k somefile
> # cp winsk.img win2k.img.bak
> # cp somefile somefile.bak
> # xm restore somefile
>
> This will "shut down" the guest for a few seconds (as long as it takes
> to copy the domain content and the files).
>
> You need to save these files together, as the "savefile.bak" will
> contain a backup of the unsaved disk-content, and since you're not
> actually using the "shutdown" of the domain itself, you'll need that to
> recover the disk content later on. 
>
> Note that the save/restore feature of HVM (fully virtualized) domains is
> new to Xen version 3.1, so you will have to update your hypervisor and
> tools before you can use this feature. 
>
> --
> mats
>  
>
> > Anyone please give me some ideas??
> >
> > Thanks a lot!
> >
> > x
> >
> > _______________________________________________
> > Xen-users mailing list
> > Xen-users@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-users
> >
> >
> >
> >    
>
>  

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