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

[Miguel Clara <miguelmclara@xxxxxxxxx>]

I noticed /etc/xen/scripts doesn't include the 'block-drbd' script,
does this come with xen or the drbd package?

Xen 4.3.1 was compiled from source, but drdb is installed from apt-get
on debian (v 8.3)

Thanks

On Tue, Feb 4, 2014 at 8:26 PM, Miguel Clara <miguelmclara@xxxxxxxxx> wrote:
> 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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