Re: [Xen-devel] Xen 4.3 xl migrate " htree_dirblock_to_tree" on second host

[Miguel Clara <miguelmclara@xxxxxxxxx>]

Thanks both for the feedback, I will test xl migrate/remus with DRDB
and post back!

As for offline migration I tried xl save + simple scp seems to do the
trick, which works for none shared storage migration as long has the
domain is stopped (which is what save does already).


On Tue, Feb 4, 2014 at 7:19 PM, Shriram Rajagopalan <rshriram@xxxxxxxxx> wrote:
> On Tue, Feb 4, 2014 at 7:35 AM, Ian Campbell <Ian.Campbell@xxxxxxxxxx>
> wrote:
>>
>>
>> > >> I have a host where what I need is to move it from host1 to host2, or
>> > >> reverse if needed, there's no problem stopping it first, but I guess
>> > >> this is not what the "migrate" command is used for!
>> > >>
>
>
> If you just need to migrate an entire VM (memory & disk)  from one host to
> another,
> without using shared storage, then there are several alternatives.
> One way is to use DRBD based disk backends (yes they can run on top of a
> LVM)
> and use protocol C (synchronous disk replication) to keep the disks at both
> hosts synchronized.
>
> Since the disk is always synchronized, you can just use the xl migrate
> command to migrate
> the memory state from one host to another, with very little downtime.
>
> I would suggest reading up on the DRBD documentation regarding xen live
> migration. IIRC,
> their current example is based on xend, but it applies equally well to xl,
> as xl also supports drbd based
> disk backends.
>
> shriram

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