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<div class="moz-cite-prefix">On 10/27/2015 11:13 AM, Frank Novak
wrote:<br>
</div>
<blockquote
cite="mid:201510271315.t9RDFsFn021351@d03av01.boulder.ibm.com"
type="cite">
<p><br>
<br>
<br>
<tt><a class="moz-txt-link-abbreviated" href="mailto:kimchi-devel-bounces@ovirt.org">kimchi-devel-bounces@ovirt.org</a> wrote on 10/27/2015 08:31:49
AM:<br>
<br>
> Date: Mon, 26 Oct 2015 16:08:11 -0200<br>
> From: <a class="moz-txt-link-rfc2396E" href="mailto:dhbarboza82@gmail.com"><dhbarboza82@gmail.com></a><br>
> To: Kimchi Devel <a class="moz-txt-link-rfc2396E" href="mailto:kimchi-devel@ovirt.org"><kimchi-devel@ovirt.org></a><br>
> Subject: [Kimchi-devel] [PATCH 0/3] Live migration
backend<br>
> Message-ID:
<a class="moz-txt-link-rfc2396E" href="mailto:1445882894-10208-1-git-send-email-dhbarboza82@gmail.com"><1445882894-10208-1-git-send-email-dhbarboza82@gmail.com></a><br>
> <br>
> From: Daniel Henrique Barboza
<a class="moz-txt-link-rfc2396E" href="mailto:dhbarboza82@gmail.com"><dhbarboza82@gmail.com></a><br>
> <br>
> This patch series implements the first release of the
Live (and cold!)<br>
> migration in Kimchi.<br>
> <br>
> *** Requirements for a VM migration ***<br>
> <br>
> - shared storage. The disk/storage path must be the same
at the origin<br>
> and destination.</tt><br>
<tt>Is this a temporary restriction in kimchi? </tt><br>
<tt>We otherwise do support live migration w/ storage...<br>
</tt></p>
</blockquote>
<br>
I guess I've expressed myself poorly there. What I meant was that
the VM must be in the same<br>
storage pool at both hosts (shared storage). For example, a
NFS/iSCSI storage pool that contains<br>
both the source and destination. The idea is that the migration
process will only copy the VM<br>
RAM - the disks would be accessible by the VM at the destination
from the same path.<br>
<br>
I am aware that there is an option to copy the storage (non-shared
storage migration) but I've found<br>
out that it isn't that supported by Red Hat for example:<br>
<br>
<a class="moz-txt-link-freetext"
href="https://access.redhat.com/solutions/60034">https://access.redhat.com/solutions/60034</a>
<br>
<br>
"Live migration with non-shared storage in RHEL6/RHEV3.* is a
deprecated functionality, but under certain circunstances and with
some limitations, it works fine. In RHEL7, this feature has been
disabled."
<br>
<br>
<br>
However, if some distro that Kimchi supports still have support for
non shared migration, we can<br>
add this option as well.<br>
<br>
<blockquote
cite="mid:201510271315.t9RDFsFn021351@d03av01.boulder.ibm.com"
type="cite">
<p><tt>> <br>
> - password-less login<br>
> <br>
> - enough resorces in the destination host to allocate the
VM<br>
> <br>
> <br>
> Limitations of this first version and possible candidates
for future work:<br>
> <br>
> - do not automate the process of password-less login (but
it is able to<br>
> verify this condition)<br>
> <br>
> - due to the above limitation, the 'user' parameter value
is only 'root'<br>
> at this moment<br>
> <br>
> - do not verify the 'shared storage' condition<br>
> <br>
> - do not verify same hypervisor/arch conditions<br>
> <br>
> - the origin VM will shutdown after migration (not sure
if can be helped)<br>
> <br>
Ahh, shutdown where, if it was running on source, it should be
running on destination..</tt><br>
<tt>clearly it will not be on source anymore.. </tt><br>
</p>
</blockquote>
Yeah, that was my reasoning when seeing the VM shutting down
automatically in the<br>
source after the migration was successful. <br>
<br>
<br>
<br>
<br>
Daniel<br>
<br>
<br>
<blockquote
cite="mid:201510271315.t9RDFsFn021351@d03av01.boulder.ibm.com"
type="cite">
<p><tt>> <br>
> <br>
</tt><br>
<br>
Cheers,<br>
Frank <br>
<br>
</p>
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</blockquote>
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