Capacity planning, Sizing guide, Performance Tuning or Benchmarks for RH-SSO

Issue

• Does a capacity planning or sizing guide exist?
• What are the recommended best practices for performance tuning or benchmarking?
• Is there any documentation on the hardware requirements for running RH SSO? In particular, We are trying to get a sense of:
  1) How much storage space should be allocated for our external DB (MSSQL).
  2) The server requirements (e.g. CPU, mem, etc.) for hosting an RH SSO instance.