|
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-users] Block level domU backup
On Fri, Oct 31, 2008 at 9:05 AM, Javier Guerra <javier@xxxxxxxxxxx> wrote: > On Fri, Oct 31, 2008 at 7:59 AM, Dustin Henning > <Dustin.Henning@xxxxxxxxxxx> wrote: >> You are correct, outgoing packets that were part of a stream would >> be discarded for being out of order. However, new connections (for mail >> about to be delivered from queue, for example) would be established as new >> connections and go through. This would be true even if you tried restoring >> without networking, which may or may not be an option, as the mail would >> still be in queue upon starting up. > > this would also happen with a traditional backup. > > not something to lose sleep on > > > -- > Javier > Anyway, I finally got around to testing it. Everything seems to work just fine. Here is my script's logfile for the test run with time stamps. Oct 31 15:27:20 --> Beginning sync. Oct 31 15:27:20 --> Pausing domU webserver and saving xen checkpoint file... Oct 31 15:27:40 --> Creating root snapshot... Logical volume "webserver_snapshot" created Oct 31 15:27:43 --> Creating swap snapshot... Logical volume "webserver_swap_snapshot" created Oct 31 15:27:43 --> Restoring Xen domU... Oct 31 15:28:03 --> Syncing swap volume... Oct 31 15:28:29 --> Removing swap snapshot... Logical volume "webserver_swap_snapshot" successfully removed Oct 31 15:28:30 --> Syncing root volume... Oct 31 15:30:08 --> Removing root snapshot... Logical volume "webserver_snapshot" successfully removed Oct 31 15:30:09 --> Transferring checkpoint file... Oct 31 15:30:42 --> Transferring config file... Oct 31 15:30:43 --> Done! As you can see, the domU remains paused for a little over 40 seconds, and the snapshots exist for a little more than 2 minutes. For those 2 minutes, I/O efficiency will suffer, but as long as we do this during non-peak hours, it should be a non-issue. I'm still nervous about some bug in xen causing the domU to not restore after the snapshots get created, but after some more extensive testing I hope to put that worry to rest. I did run into an issue when I restored the domU on the backup server. I was not able to ssh in. That was the only service running on that domU. However, after restarting, I was able to ssh just fine, and everything else seems normal. I'll keep testing and report any findings. -- Agent Rooker _______________________________________________ Xen-users mailing list Xen-users@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-users
|
 |
Lists.xenproject.org is hosted with RackSpace, monitoring our |