I too noticed the:

Nov 23 03:17:47 ub01 multipathd[179286]: io_setup failed
Nov 23 03:17:47 ub01 multipathd[179286]: uevent trigger error

Errors - and they continue to persist in recent recreate attempts. I
think it would be good to configure multipath such that the devices
provided by Cinder are excluded. Likely the best approach would be a
general blacklist of all devices and provide exclusions for the known
backends that you have for other storage devices.

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https://bugs.launchpad.net/bugs/1644785

Title:
  Ubuntu Openstack Mitaka can only deploy up to 52 instances

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