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Re: [Qemu-devel] [question] incremental backup a running vm


From: Paolo Bonzini
Subject: Re: [Qemu-devel] [question] incremental backup a running vm
Date: Mon, 26 Jan 2015 12:28:34 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.4.0


On 26/01/2015 12:13, Zhang Haoyu wrote:
> Thanks, Paolo,
> but too many internal snapshots were saved by customers,
> switching to external snapshot mechanism has significant impaction
> on subsequent upgrade.

In that case, patches are welcome. :)

> Another problem:
> drive_backup just implement one time backup,
> but I want VMWare's VDP-like backup mechanism.
> The initial backup of a virtual machine takes comparatively more time,
> because all of the data for that virtual machine is being backed up. 
> Subsequent backups of the same virtual machine take less time, because
> changed block tracking (log dirty) mechanism is used to only backup the dirty 
> data.
> After inittial backup done, even the VM shutdown, but subsequent backup also 
> only 
> copy the changed data.

As mentioned before, patches for this are on the list.

Paolo



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