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Re: [Xen-users] Backup a DomU

  • To: xen-users@xxxxxxxxxxxxx
  • From: Niels Dettenbach <nd@xxxxxxxxxxxx>
  • Date: Thu, 12 Apr 2012 12:11:25 +0200
  • Delivery-date: Thu, 12 Apr 2012 10:13:20 +0000
  • List-id: Xen user discussion <xen-users.lists.xen.org>

Am Donnerstag, 12. April 2012, 11:43:13 schrieb Stefan Becker:
> I copy the disk, swap and cfg files.... What do you mean with full system?
If you just pause a VM you did not have any dates from the memory. Firing a 
sysrq s did do a "sync" to the discs but as the filesystems are not cleanly 
umounted, filehandles are closed and processes are hung up your system could 
not understand as "completely consistent". You just "hope" that everything 
it's on his place when you copy it...

Depending from the load of your system and the time between sysrq s and vm 
pause disk content would be differ more or less too.

I do not know the book but from my understanding this is a ugly hack which may 
work - but not a real solution...

In such cases it may much more sense to use any simple but working backup 
utility like dump / restore. Handling with MySQL databases requires to use 
something like mysqldump or cleanly shutting down MySQL as MySQL uses it's own 
technologies for caching and buffering beside the OS ones...

best regards,


 Niels Dettenbach
 Syndicat IT & Internet

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