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<div class="moz-cite-prefix">OK, thank you for the sanity check.<br>
<br>
Dan<br>
<br>
On 01/16/2014 11:29 AM, Vishvananda Ishaya wrote:<br>
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In that case, this sounds like a bug to me related to lvm volumes.
You should check the nova-compute.log from both hosts and the
nova-conductor.log. If it isn’t obvious what the problem is, you
should open a bug and attach as much info as possible.
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<div>Vish</div>
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<div>On Jan 16, 2014, at 8:04 AM, Dan Genin <<a
moz-do-not-send="true"
href="mailto:daniel.genin@jhuapl.edu">daniel.genin@jhuapl.edu</a>>
wrote:</div>
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<div class="moz-cite-prefix">Thank you for replying,
Vish. I did sync and verified that the file was
written to the host disk by mounting the LVM volume on
the host.<br>
<br>
When I tried live migration I got a Horizon blurb
"Error: Failed to live migrate instance to host" but
there were no errors in syslog.<br>
<br>
I have been able to successfully migrate a Qcow2
backed instance.<br>
Dan<br>
<br>
On 01/16/2014 03:18 AM, Vishvananda Ishaya wrote:<br>
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<div>This is probably more of a usage question, but I
will go ahead and answer it.</div>
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If you are writing to the root drive you may need to
run the sync command a few times to make sure that the
data has been flushed to disk before you kick off the
migration.
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<div>The confirm resize step should be deleting the
old data, but there may be a bug in the lvm backend
if this isn’t happening. Live(block) migration will
probably be a bit more intuitive.</div>
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<div>Vish</div>
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<div>On Jan 15, 2014, at 2:40 PM, Dan Genin <<a
moz-do-not-send="true"
href="mailto:daniel.genin@jhuapl.edu">daniel.genin@jhuapl.edu</a>>
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<div bgcolor="#FFFFFF" text="#000000"> I think
this qualifies as a development question but
please let me know if I am wrong.<br>
<br>
I have been trying to test instance migration
in devstack by setting up a multi-node
devstack following directions at <a
moz-do-not-send="true"
href="http://devstack.org/guides/multinode-lab.html">http://devstack.org/guides/multinode-lab.html</a>.
I tested that indeed there were multiple
availability zones and that it was possible to
create instances in each. The I tried
migrating an instance from one compute node to
another using the Horizon interface (I could
not find a way to <i>confirm</i><i> </i>migration,
which is a necessary step, from the command
line). I created a test file on the instance's
ephemeral disk, before migrating it, to verify
that the data was moved to the destination
compute node. After migration, I observed an
instance with the same id active on the
destination node but the test file was not
present.<br>
<br>
Perhaps I misunderstand how migration is
supposed to work but I expected that the data
on the ephemeral disk would be migrated with
the instance. I suppose it could take some
time for the ephemeral disk to be copied but
then I would not expect the instance to become
active on the destination node before the copy
operation was complete.<br>
<br>
I also noticed that the ephemeral disk on the
source compute node was not removed after the
instance was migrated, although, the instance
directory was. Nor was the disk removed after
the instance was destroyed. I was using LVM
backend for my tests. <br>
<br>
I can provide more information about my setup
but I just wanted to check whether I was doing
(or expecting) something obviously stupid.<br>
<br>
Thank you,<br>
Dan<br>
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