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<div class="moz-cite-prefix">Raw backed instance migration also
works so this appears to be an LVM issue.<br>
<br>
On 01/16/2014 11:04 AM, Dan Genin wrote:<br>
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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>>
wrote:</div>
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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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