<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=18223) </details> <!--IssueSummary end--> ### Background: Our current [hardware requirements](https://docs.gitlab.com/ce/install/requirements.html#hardware-requirements) should describe the requirements for customers using HA infrastructure on cloud services. The current requirements apply to a complete stack hosted on a single server. However our customers using HA infrastructure will be using the following services with resource usage divided among them: - GitLab application -> EC2 Instances - Redis cache -> Elasticache - Database -> RDS **What questions are you trying to answer?** Per 100 users, what instance size do we recommend for each service? i.e. 100 users = 2 x m3.large EC2 instances, 1 x r3.medium Elasticache, 1 x c4.large RDS. **Are you looking to verify an existing hypothesis or uncover new issues you should be exploring?** We can utilise the same tests that determine our current requirements then optimize the test for an HA environment. **What is the backstory of this project and how does it impact the approach?** Customer asked for this information and we were unable to provide an accurate response. ZD: https://gitlab.zendesk.com/agent/tickets/77146 **What do you already know about the areas you are exploring?** We have our current requirements described here: https://docs.gitlab.com/ce/install/requirements.html#hardware-requirements If we can identify % of CPU, memory and disk I/O for each service then we can provide this as a baseline for our HA infrastructure. **What does success look like at the end of the project?** Documentation / Requirements that can be linked to from the HA docs: http://docs.gitlab.com/ce/administration/high_availability/README.html ### Links / references: