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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: Wed, 21 Jan 2015 11:39:44 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.3.0


On 21/01/2015 11:32, Zhang Haoyu wrote:
> Hi,
> 
> Does drive_mirror support incremental backup a running vm?
> Or other mechanism does?
> 
> incremental backup a running vm requirements:
> First time backup, all of the allocated data will be mirrored to destination,
> then a copied bitmap will be saved to a file, then the bitmap file will log 
> dirty for
> the changed data.
> Next time backup, only the dirty data will be mirrored to destination.
> Even the VM shutdown and start after several days,
> the bitmap will be loaded while starting vm.
> Any ideas?

Drive-mirror is for storage migration.  For backup there is another job,
drive-backup.  drive-backup copies a point-in-time snapshot of one or
more disks corresponding to when the backup was started.

Incremental backup is being worked on.  You can see patches on the list.

Paolo



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