Re: [Xen-users] Backup domU xen

[Pascal Nobus <pascal@xxxxxxxx>]

It worked for 1 domU, but when doing this with another domU, it resulted 
in a not responding system because of the load.
Memory is not the problem (dom0 has 746 MB).
This night I made a perfect backup by putting rsyncd.daemon on the 
domU's, and rsyncing over ethernet to dom0.
There is nothing in the logs (messages,syslog,xend), not a single line.

The problem is within the snapshot I think, it gives me a instant load, 
but not all the times (about 50% is done without a load-peak)
This is done within 2-seconds:
@xen1:~# cat /proc/loadavg
0.02 0.02 0.00 1/72 8252
@xen1:~# /sbin/lvcreate -L12G -s -n arrowsnapshot /dev/xen-vol/arrow-disk
  Logical volume "arrowsnapshot" created
@xen1:~# cat /proc/loadavg
0.33 0.08 0.03 1/71 8306

Althoug the .33 isn't a problem, the load when crashed was more than 4 
(maximum of mrtg-measurement)


Marc Patino Gómez schreef:
> Hi,
>
> I used these steps to backup my domUs and never I had this problem.
>
>
> Pascal Nobus wrote:
> > .... seem to be a never ending story ...
> > I've found the problem of my crashes (two days on a row now).
> >
> > I'm using lvm2 as a filesystem, and was doing backup's like this:
> > - take a snapshot of a running system
> > - mount the snapshot
> > - rsync the snapshot to my backup-partition.
> > - umount the snapshot
> > - remove the snaphost
> Have your dom0 enough memory? Snapshots  requires some aditional memory, 
> so if you had your dom0 limited to 256MB of RAM it could be a problem.
> To prevent a not responding system you can use "renice" command to 
> schedule rsync command with low priority.
> If you can post more info, like log output of the crash , probably  
> someone in the list could help you.
> Regards,
>
> Marc
> > This resulted in a huge load, which was increased 1 hour later, and 
> > resulted in a not-responding system.
> >
> > I googled now for 2 days, and found many discussions, but I cannot 
> > find a proper and stable solution.
> > Should I maybe just mount the domU over the network (portmap) to have 
> > a non-crashing solution?
> > Best regards,
> > Pascal
> >
> >
> > _______________________________________________
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> > Xen-users@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-users
>
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