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xen-users
Re: [Xen-users] Consistent snapshots
On 25/06/09 11:01, Gak wrote:
How do i create consistent snapshots of VM's from Dom0?. What are the
backup methods or snapshot/snaprestore methods that are followed for
Xen Virtual environments?.
Shut down the VM, take the snapshot.
Anything else requires serious cooperation from VM and, equally
importantly, the applications running in it. Sometimes you can get away
with suspending the guest and taking a snapshot of memory and disk at
the same time -- that isn't very useful though because to recover, say,
an individual file from the back up you have to restart the suspended
copy. Even worse, if there are any in-flight transactions between the
VM and other machines (virtual or otherwise) those will restart --
having your bank balance debited twice would be very annoying.
In the general case, you're better off running your backup within the
VM. In special cases you can do something different -- for example, you
might have a database that can get itself into a consistent state so you
can take a snapshot of its file system on a suitable NAS or SAN.
jch
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