<tt><font size=2>Hi all£º </font></tt>
<br>
<br><tt><font size=2> I got a problem described in
</font></tt><a href="https://bugs.launchpad.net/cinder/+bug/1452641"><tt><font size=2>https://bugs.launchpad.net/cinder/+bug/1452641</font></tt></a><tt><font size=2>,</font></tt>
<br><tt><font size=2>and my colleague got another similar problem described
in </font></tt><a href="https://bugs.launchpad.net/nova/+bug/1581367"><tt><font size=2>https://bugs.launchpad.net/nova/+bug/1581367</font></tt></a><tt><font size=2>.</font></tt>
<br><tt><font size=2>It's all about the storage backend ip change. With
the storage backend, not only Ceph but also IPSAN,</font></tt>
<br><tt><font size=2>when the backend's ip changed, the related volumes
attached to VMs would not be available. Previously </font></tt>
<br><tt><font size=2>I proposed to auto-check the consistency of IP record
in nova's bdm table and storage backend, which was</font></tt>
<br><tt><font size=2>submitted in </font></tt><a href=https://review.openstack.org/#/c/289813/><tt><font size=2>https://review.openstack.org/#/c/289813/</font></tt></a><tt><font size=2>.
<br>
reviewers point out that it's a waste of performance with
normal case and it's a not a good scenario <br>
to do thess checking in a regular function. I agree with this suggestion
and the bug troubled me and my </font></tt>
<br><tt><font size=2>colleagues all the time. </font></tt>
<br><tt><font size=2> I think if we can just add an
option in nova api, such as "nova reboot --refresh-conn"<br>
to manually modify the VM's bdm info when the bug happened. The "--refresh-conn"
was parsed and passed to </font></tt>
<br><tt><font size=2>"reboot_instance" function in nova-compute.
Without auto-checking, it would be more flexible and efficient.</font></tt>
<br><tt><font size=2>And I need all of your valued opinions and appreciate
for hearing from you soon. <br>
<br>
The fake code is like this in nova-compute: <br>
def reboot_instance(self, context, instance, block_device_info,
<br>
reboot_type, refresh_conn = False): <br>
"""Reboot an instance on this
host.""" <br>
<br>
... <br>
... <br>
block_device_info = self._get_instance_block_device_info(context,
<br>
instance, <br>
refresh_conn) <br>
<br>
Thank you. </font></tt>
<br>
<br><tt><font size=2>related links are as follows:</font></tt>
<br><a href="https://bugs.launchpad.net/cinder/+bug/1452641"><tt><font size=2>https://bugs.launchpad.net/cinder/+bug/1452641</font></tt></a>
<br><a href="https://bugs.launchpad.net/nova/+bug/1581367"><tt><font size=2>https://bugs.launchpad.net/nova/+bug/1581367</font></tt></a>
<br><a href=https://review.openstack.org/#/c/289813/><tt><font size=2>https://review.openstack.org/#/c/289813/</font></tt></a>
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