Re: [Xen-users] xl save/restore command

[Melanie Desaive <desaive@xxxxxx>]

Hello Ian,

thanks a lot for the swift answer.

The solution of using xl save -p in combination with LVM-snapshot / disk 
file backup is also fine.
I will have a second look into it tomorrow. Could in fact be that the 
file was not written out to storage. Sad. Would have been a great 
feature... ;)
Kind regards,

Melanie

On 28.08.2014 14:41, Ian Murray wrote:
> > ________________________________
> > From: Melanie Desaive <desaive@xxxxxx>
> > To: xen-users@xxxxxxxxxxxxx
> > Sent: Thursday, 28 August 2014, 13:04
> > Subject: [Xen-users] xl save/restore command
> >
> >
> > Hello everybody,
> >
> > I am currently trying to figure out, what the xl commands "save/restore"
> > are exactly doing in case I leave the domain running after issuing the
> > save command.
> >
> > I tested the following szenario:
> >
> > ---
> >
> > Saving domain with "xl save -c <domain> <statefile>"
> >
> > After completion creating a new file on domU.
> >
> > Destroying domU
> >
> > Restore domU with "xl restore <statefile>" -> The new file disappeared
> > from domU.
> >
> > Shutdown domU
> >
> > Recreate domU from configfile with "xl create <configfile> -> The file
> > is back again.
> >
> > ---
> >
> > Does the save command checkpoint the domUs filesystems so that it can be
> > used to create kind of a snapshot?
> As far as I know, xl save/restore are not storage aware. You might want to 
> consider Xl save -p then then using your storage method's native snapshotting 
> technique. I only use logical volumes, so apologies if that answer is incorrect 
> for other storage types.
>
> I notice there is a problem with xl save -p when using Xenified kernels such as 
> CentOS 5. I wrote the -p patch but heavily under the guidance of proper devs, 
> so I can't say I understood the ins and outs of it.
>
>
> In terms of the scenario you describe, I would say (without futher information) 
> that the new file wasn't fully committed to storage when you destroyed the domU.
>
>
> > Can someone point me to some in depth documentation or maybe give a
> > short summary, what the command is actually doing?
> >
> > Many thanks in advance.
> >
> > Kind regards,
> >
> > Melanie
> > ---
> >
> >
> >
> >
> > _______________________________________________
> > Xen-users mailing list
> > Xen-users@xxxxxxxxxxxxx
> > http://lists.xen.org/xen-users
--

Melanie Desaive
Brehmestrasse 52
13187 Berlin

Telefon: 030 - 202 372 00
Mobil:   0178 - 539 8725


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