List, I am going ahead to adopt OpensStack for our Live deployment sites which all are running previously on proprietary HCI solutions. *Few queries.* 1. Which base Operating System need to be selected for production? ( prefer OpenSource community Operating Systems.) Is Debian a good choice? If so, which version ? Or any other suggestions? 2. What backend / SDS needs to be configured for a crash resistant FaultTolerant cluster. In case of a node / Disks failure which can withstand the workload and most preferably avoid data loss in the worst case scenario. 3. Heard about Ceph. How its a best choice for a 24x7 mission critical cluster? kindly advise. If so, what configuration architecture needs to be considered ? 3. My luxury is only at an On Prem Server Cluster comprising a minimum 3 to max 4 Nodes. ( possible DELL 650 or 750 series OR HPE servers ) . 4. As my cluster resources are limited to 3 to 4 server nodes / site ( 2 X32C 64 Threads, Intel Xeon Gold processors, with min 512 GB Ram , 4 x3.94TB SSD or 8 x1.92TB in each node) Is it reliable/advisable to set Controllers, Compute and Storage all together in these three or four nodes? Which is the best possible deployment options I can have with these 3/4 nodes. Kindly shed some light . 5. Any other points need to be considered while this must be a reliable infrastructure for running a mission critical 24x7 operation. 6. Which mode of installation I can choose, the Kolla-ansible multinode is advisable for a production deployment ? ( I am familiar with the kolla-ansible all-in-one installation ) OR ther a better deployment method for production sites ? ) Kindly shed some light and your valuable suggestions . Any hints most welcome. Thank you, Krish