[Openstack-operators] Strange behaviour change in cinder with a Dell compellent backend

Jean-Philippe Méthot jp.methot at planethoster.info
Tue Apr 24 00:58:26 UTC 2018


This is a very strange behaviour that has causing me issues with my SAN ever since we upgraded to Mitaka or Ocata I believe, several months ago. Essentially, I used to be able to change the ID of a disk in the SAN to swap the disk in Openstack. So, for example, I had disk 1. I could restore a snapshot of disk 1 on disk 2, rename disk 1 to disk 1-bak and rename disk 2 to disk 1 and the VM would start booting off of the new disk I had just made. This has changed. Now, somehow, Openstack sticks to the original disk even if I rename the disk. 

While annoying, this behaviour didn’t really cause me that many issues. However, I have discovered that if I migrate VMs on which such an operation happened, the VM will try to boot off the original disk from several months ago, despite the new disk being there with the correct ID. How can Openstack find the old disk even if its ID in the SAN has changed? 

Jean-Philippe Méthot
Openstack system administrator
Administrateur système Openstack
PlanetHoster inc.

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openstack.org/pipermail/openstack-operators/attachments/20180424/fec4bf5e/attachment.html>

More information about the OpenStack-operators mailing list