# SAP Cloud Infrastructure: 4+1 IaaS Strategy Explained
> Explore SAP's 4+1 infrastructure strategy, featuring 22 API services based on OpenStack and Kubernetes orchestration for modern enterprise applications.

Tags: sap-cloud, iaas-strategy, openstack, kubernetes, cloud-infrastructure, enterprise-it, datacenters
## SAP Cloud Infrastructure Overview
- Strategic Infrastructure-as-a-Service (IaaS) stack optimized for SAP solutions.
- Built for high availability and running purely in SAP datacenters.
- Designed as a modern, hyperscaler-like self-service platform.

## The 4+1 Infrastructure Strategy
- **Problem:** Previously managed 20+ siloed legacy infrastructure stacks with high operational overhead.
- **Solution:** Transition to a single unified IaaS platform (+1) supporting 22 multi-tenant API services.

## 22 Unified API Services
- **OpenStack Foundation (11 Services):** Includes Nova (Compute), Cinder/Swift (Storage), Neutron (Networking), Keystone (Identity), and Heat (Orchestration).
- **SAP In-House (11 Services):** Specialized features for S/4HANA, Machine Learning infrastructure, High Availability clustering, Security/Compliance tools, and Monitoring.

## Technology Stack & Orchestration
- **Hardware Partners:** Utilizes best-of-breed hardware from Lenovo, Dell, Cisco, and Arista.
- **Kubernetes:** All SAP CI services are containerized and orchestrated via Kubernetes to allow for independent deployment and self-service management.

## Key Takeaways
- SAP CI consolidates complex legacy environments into one self-service platform.
- Combines open-source OpenStack with custom enterprise extensions.
- Orchestrated with Kubernetes for modern scalability.
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