[Qemu-devel] Re: [PATCH 0/3] Live migration without shared storage (improved version)

[Jan Kiszka]

address@hidden wrote:
> This series adds support for live migration without shared storage, means 
> copy the storage while migrating. It was tested with KVM. Supports 2 ways 
> to replicate the storage during migration:
>  1. Complete copy of storage to destination 
>  2. Assuming the storage is cow based, copy only the allocated 
>     data, time of the migration will be linear with the amount of allocated 
>     data (user responsibility to verify that the same backend file reside 
>     on src and destination).
> 
> Live migration will work as follows:
> (qemu) migrate -d tcp:0:4444 # for ordinary live migration
> (qemu) migrate -d blk tcp:0:4444 # for live migration with complete storage 
> copy
> (qemu) migrate -d blk inc tcp:0:4444 # for live migration with incremental 
> storage copy, storage is cow based.
> 
> The patches are against git://git.kernel.org/pub/scm/virt/kvm/qemu-kvm.git 
> kvm-87

As you are posting to qemu-devel, you should base your work on top of
qemu.git master and make sure that it still works as intended. Upstream
has KVM support (that is normally even usable), so testing won't take
much longer than with qemu-kvm.

Nice feature by the way! Are you (also) using it to generate backups of
a VM without stopping it (for a noticeably long time)? That's what we
have in mind ATM.

Jan

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