Hi everyone, As part of its goal of further pushing back scaling limits within a given cluster, the Large Scale SIG would like to collect scaling stories from OpenStack users. There is a size/load limit for single clusters past which things in OpenStack start to break, and we need to start using multiple clusters or cells to scale out. The SIG is interested in hearing: - what broke first for you, is it RabbitMQ or something else - what were the first symptoms - at what size/load did it start to break This will be a great help to document expected limits, and identify where improvements should be focused. You can contribute your experience by replying directly to this thread, or adding to the following etherpad: https://etherpad.openstack.org/p/scaling-stories Thanks in advance for your help ! -- Thierry Carrez (ttx) on behalf of the Large Scale SIG