Queens release was the first one which addressed OpenStack problem of upgrades between relatively frequent releases.

Fast Forward Upgrade (FFU), Skip Upgrade or (N+3) upgrade are the terms describe the same thing, upgrade from OpenStack Newton to OpenStack Queens.

We are now a year after Queens release and it may be a good time to look again on the N+3 upgrade,
when Telcos are scheduling to perform upgrades on their own infrastructure and understand the complexity of these upgrades.

In Telco world, OpenStack upgrade can't be isolated from other components and triggers other elements upgrade:

operating system upgrade
kernel drivers upgrades
HW firmware upgrades
and finally, VNFs workload running on top of the cluster which often need to be upgraded as well

On this session, I am going to discuss the most common problems we've seen so far?
Share some lessons learned. And compare TripleO (N+3) upgrade with other ways of doing the upgrades.

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