This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
Home Products Support Community News


RE: [Xen-devel] Xen support online backup?

> Date: Thu, 28 Jul 2011 12:22:21 +0100
> From: stefano.stabellini@xxxxxxxxxxxxx
> To: zpfalpc23@xxxxxxxxxxx
> CC: xen-devel@xxxxxxxxxxxxxxxxxxx
> Subject: Re: [Xen-devel] Xen support online backup?
> On Thu, 28 Jul 2011, pengfei zhang wrote:
> > I recently used the Xen virtual machine backup tools, such as 'xm save'
> > command. And I found that before this tool save the memory and CPU state, it
> > first pauses the VM. Do Xen have same tools for online backup the VMs? If it
> > do not have one, can I saty that Xen don't support VM online backup?
> >
> you are probably looking for xl (or xm) save -c:
> Usage: xl [-v] save [options] <Domain> <CheckpointFile> [<ConfigFile>]
> Save a domain state to restore later.
> Options:
> -h Print this help.
> -c Leave domain running after creating the snapshot.

Thank you for your reply!
I have tested the command use '-c' option. The virtual machine has about 20 seconds paused.
If the virtual machine works as a server, no user can tolarate 20 seconds access delay, I think.

What I curious is that VMware Workstation have a feature call snapshot manager,
it can make a snapshot of the VM state online, which don't need to pause the 
service. How about Xen?
Thanks a lot!

pengfei zhang
Xen-devel mailing list
<Prev in Thread] Current Thread [Next in Thread>